{"transactions":[{"id":1535758,"issuer":{"id":8819,"kind":"organization","name":"RIDGEFIELD ACQUISITION CORP"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2024-04-25T20:15:23.000Z","date":"2024-04-23","kind":"purchase","planned":false,"acquired":true,"shares":25000000,"price":0.002,"value":50000.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 omits 711 shares of common stock owned by Mr. Bronson's former spouse and 34,358 shares of common stock owned by Mr. Bronson's parents, which shares previously were reported on Form 4 as indirectly owned by Mr. Bronson. Mr. Bronson has no pecuniary interest in these shares."}],"balance_after":25007500,"source":{"system":"sec-edgar","filing":"0001104659-24-051973","document":"tm2412688-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/812152/000110465924051973/tm2412688-1_4seq1.xml","form_type":"4"}},{"id":1760854,"issuer":{"id":8819,"kind":"organization","name":"RIDGEFIELD ACQUISITION CORP"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2023-10-13T21:20:42.000Z","date":"2023-10-11","kind":"other","planned":false,"acquired":true,"shares":34358,"ownership":{"direct":false,"nature":"By Mr. Bronson's parents"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This Form 4 is being filed to reflect the assumption by Mr. Bronson of shared trading control over 34,358 shares held in the account of his parents."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Mr. Bronson disclaims beneficial ownership of the shares of common stock except to the extent of his pecuniary interest therein."}],"balance_after":34358,"source":{"system":"sec-edgar","filing":"0001104659-23-109164","document":"tm2328476d1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/812152/000110465923109164/tm2328476d1_4seq1.xml","form_type":"4"}},{"id":1760853,"issuer":{"id":6861,"kind":"organization","name":"INTERLINK ELECTRONICS INC"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman, President and CEO"}}],"security":"Common Stock","published_at":"2023-10-13T19:45:36.000Z","date":"2023-10-11","kind":"other","planned":false,"acquired":true,"shares":13115,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By Mr. Bronson's parents"},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This Form 4 is being filed to reflect the assumption by Mr. Bronson of shared trading control over 13,115 shares held in the account of his parents."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Mr. Bronson disclaims beneficial ownership of the shares of common stock except to the extent of his pecuniary interest therein. In the case of the 206,000 shares held by his former spouse, Mr. Bronson has sole voting and dispositive power."}],"balance_after":13115,"source":{"system":"sec-edgar","filing":"0001104659-23-109081","document":"tm2328391-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/828146/000110465923109081/tm2328391-2_4seq1.xml","form_type":"4"}},{"id":2042832,"issuer":{"id":6861,"kind":"organization","name":"INTERLINK ELECTRONICS INC"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"Chairman, President and CEO"}}],"security":"Common Stock","published_at":"2023-01-31T00:44:03.000Z","date":"2023-01-26","kind":"other","acquired":false,"shares":4022140,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This Form 4 is being filed to reflect the contribution by Mr. Bronson and his spouse to SB4 Investments, LLC of 4,022,140 shares previously held by them as joint tenants. Mr. Bronson is the managing member of SB4 Investments, LLC."}],"balance_after":226900,"source":{"system":"sec-edgar","filing":"0001104659-23-008136","document":"tm234950-2_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/828146/000110465923008136/tm234950-2_4seq1.xml","form_type":"4"}},{"id":2768792,"issuer":{"id":8819,"kind":"organization","name":"RIDGEFIELD ACQUISITION CORP"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President"}}],"security":"Common Stock","published_at":"2021-03-30T11:00:57.000Z","date":"2021-03-26","kind":"purchase","acquired":true,"shares":1600000,"price":0.25,"value":400000.0,"ownership":{"direct":true},"balance_after":2638004,"source":{"system":"sec-edgar","filing":"0001104659-21-043611","document":"tm2111295d1_4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/812152/000110465921043611/tm2111295d1_4.xml","form_type":"4"}},{"id":3219608,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Restricted Stock Units","published_at":"2020-03-10T20:01:40.000Z","date":"2020-03-06","kind":"exercise","acquired":false,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Each restricted stock unit represents a contingent right to one share of Qualstar Corporation common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F5","text":"For each of the fiscal years ended December 31, 2019 and December 31, 2020, RSUs for 25,000 shares of the Company's Common Stock shall vest and become issuable subject to the Company's achievement of financial and performance objectives for the applicable fiscal year established by the Compensation Committee of the Company's Board of Directors. Whether recipient's RSUs for the applicable fiscal year become vested and issuable shall be determined solely in the discretion of the Compensation Committee, or if such committee does not then exist at the time of determination, the Company's Board of Directors (excluding Executive)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F6","text":"Subject to Sections 9.7(b) and 9.7(d) of that certain Employment Agreement entered into on April 13, 2019 by and between the Company and Steven N. Bronson, any such RSUs shall not be earned by or vest in recipient until the date such number, if any, is determined by the Compensation Committee. On March 6, 2020, the Company issued to Mr. Bronson 25,000 shares of the Company's Common Stock for the achievement of financial and performance objectives for the fiscal year ended December 31, 2019."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F5","text":"For each of the fiscal years ended December 31, 2019 and December 31, 2020, RSUs for 25,000 shares of the Company's Common Stock shall vest and become issuable subject to the Company's achievement of financial and performance objectives for the applicable fiscal year established by the Compensation Committee of the Company's Board of Directors. Whether recipient's RSUs for the applicable fiscal year become vested and issuable shall be determined solely in the discretion of the Compensation Committee, or if such committee does not then exist at the time of determination, the Company's Board of Directors (excluding Executive)."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F6","text":"Subject to Sections 9.7(b) and 9.7(d) of that certain Employment Agreement entered into on April 13, 2019 by and between the Company and Steven N. Bronson, any such RSUs shall not be earned by or vest in recipient until the date such number, if any, is determined by the Compensation Committee. On March 6, 2020, the Company issued to Mr. Bronson 25,000 shares of the Company's Common Stock for the achievement of financial and performance objectives for the fiscal year ended December 31, 2019."}],"balance_after":25000,"derivative":{"underlying":"Common Stock","underlying_shares":25000},"source":{"system":"sec-edgar","filing":"0001104659-20-031518","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465920031518/a4.xml","form_type":"4"}},{"id":3219607,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2020-03-10T20:01:40.000Z","date":"2020-03-06","kind":"exercise","acquired":true,"shares":25000,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. (\"BKF Capital\"), BKF Asset Holdings, Inc. (\"BKF Holdings\") and Steven N. Bronson (collectively, the \"Reporting Persons\"). Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Each restricted stock unit represents a contingent right to one share of Qualstar Corporation common stock."}],"balance_after":39617,"source":{"system":"sec-edgar","filing":"0001104659-20-031518","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465920031518/a4.xml","form_type":"4"}},{"id":3385057,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}}],"security":"Restricted Stock Units (''RSUs'')","published_at":"2019-10-31T20:52:13.000Z","date":"2019-10-29","kind":"grant","acquired":true,"shares":50000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit represents a contingent right to one share of Qualstar Corporation common stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"For each of the fiscal years ended December 31, 2019 and December 31, 2020, RSUs for 25,000 shares of the Company's Common Stock shall vest and become issuable subject to the Company's achievement of financial and performance objectives for the applicable fiscal year established by the Compensation Committee of the Company's Board of Directors. Whether recipient's RSUs for the applicable fiscal year become vested and issuable shall be determined solely in the discretion of the Compensation Committee, or if such committee does not then exist at the time of determination, the Company's Board of Directors (excluding Executive). Subject to Sections 9.7(b) and 9.7(d) of that certain Employment Agreement entered into on April 13, 2019 by and between the Company and Steven N. Bronson, any such RSUs shall not be earned by or vest in recipient until the date such number, if any, is determined by the Compensation Committee."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"For each of the fiscal years ended December 31, 2019 and December 31, 2020, RSUs for 25,000 shares of the Company's Common Stock shall vest and become issuable subject to the Company's achievement of financial and performance objectives for the applicable fiscal year established by the Compensation Committee of the Company's Board of Directors. Whether recipient's RSUs for the applicable fiscal year become vested and issuable shall be determined solely in the discretion of the Compensation Committee, or if such committee does not then exist at the time of determination, the Company's Board of Directors (excluding Executive). Subject to Sections 9.7(b) and 9.7(d) of that certain Employment Agreement entered into on April 13, 2019 by and between the Company and Steven N. Bronson, any such RSUs shall not be earned by or vest in recipient until the date such number, if any, is determined by the Compensation Committee."}],"balance_after":50000,"derivative":{"underlying":"Common Stock","underlying_shares":50000},"source":{"system":"sec-edgar","filing":"0001104659-19-058572","document":"a4.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/758938/000110465919058572/a4.xml","form_type":"4"}},{"id":3407563,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-09-24T18:07:02.000Z","date":"2019-09-23","kind":"purchase","acquired":true,"shares":5000,"price":6.3912,"value":31956.0,"ownership":{"direct":false,"nature":"By BKF Asset Holdings, Inc."},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. (\"BKF Capital\"), BKF Asset Holdings, Inc. (\"BKF Holdings\") and Steven N. Bronson (collectively, the \"Reporting Persons\"). Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents shares of common stock owned directly by BKF Holdings.  BKF Holdings is wholly owned by BKF Capital.  Steven N. Bronson, as the Chairman, CEO and majority shareholder of BKF Capital and the CEO of BKF Holdings, may be deemed to be the beneficial owner of the shares of Qualstar Corporation held by BKF Holdings."}],"balance_after":708286,"source":{"system":"sec-edgar","filing":"0001104659-19-051225","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465919051225/a4.xml","form_type":"4"}},{"id":3407562,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-09-24T18:07:02.000Z","date":"2019-09-20","kind":"purchase","acquired":true,"shares":3285,"price":6.2652,"value":20581.182,"ownership":{"direct":false,"nature":"By BKF Asset Holdings, Inc."},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. (\"BKF Capital\"), BKF Asset Holdings, Inc. (\"BKF Holdings\") and Steven N. Bronson (collectively, the \"Reporting Persons\"). Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents shares of common stock owned directly by BKF Holdings.  BKF Holdings is wholly owned by BKF Capital.  Steven N. Bronson, as the Chairman, CEO and majority shareholder of BKF Capital and the CEO of BKF Holdings, may be deemed to be the beneficial owner of the shares of Qualstar Corporation held by BKF Holdings."}],"balance_after":703286,"source":{"system":"sec-edgar","filing":"0001104659-19-051225","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465919051225/a4.xml","form_type":"4"}},{"id":3413421,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-09-17T19:05:44.000Z","date":"2019-09-16","kind":"purchase","acquired":true,"shares":12757,"price":6.1275,"value":78168.5175,"ownership":{"direct":false,"nature":"By BKF Asset Holdings, Inc."},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. (\"BKF Capital\"), BKF Asset Holdings, Inc. (\"BKF Holdings\") and Steven N. Bronson (collectively, the \"Reporting Persons\"). Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents shares of common stock owned directly by BKF Holdings.  BKF Holdings is wholly owned by BKF Capital.  Steven N. Bronson, as the Chairman, CEO and majority shareholder of BKF Capital and the CEO of BKF Holdings, may be deemed to be the beneficial owner of the shares of Qualstar Corporation held by BKF Holdings."}],"balance_after":700001,"source":{"system":"sec-edgar","filing":"0001104659-19-050440","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465919050440/a4.xml","form_type":"4"}},{"id":3413420,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-09-17T19:05:44.000Z","date":"2019-09-13","kind":"purchase","acquired":true,"shares":22363,"price":5.9875,"value":133898.4625,"ownership":{"direct":false,"nature":"By BKF Asset Holdings, Inc."},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. (\"BKF Capital\"), BKF Asset Holdings, Inc. (\"BKF Holdings\") and Steven N. Bronson (collectively, the \"Reporting Persons\"). Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents shares of common stock owned directly by BKF Holdings.  BKF Holdings is wholly owned by BKF Capital.  Steven N. Bronson, as the Chairman, CEO and majority shareholder of BKF Capital and the CEO of BKF Holdings, may be deemed to be the beneficial owner of the shares of Qualstar Corporation held by BKF Holdings."}],"balance_after":687244,"source":{"system":"sec-edgar","filing":"0001104659-19-050440","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465919050440/a4.xml","form_type":"4"}},{"id":3413419,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-09-17T19:05:44.000Z","date":"2019-08-22","kind":"purchase","acquired":true,"shares":47,"price":4.61,"value":216.67,"ownership":{"direct":false,"nature":"By BKF Assets Holdings, Inc."},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. (\"BKF Capital\"), BKF Asset Holdings, Inc. (\"BKF Holdings\") and Steven N. Bronson (collectively, the \"Reporting Persons\"). Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."},{"field":"security","element":"securityTitle","label":"F2","text":"Represents a purchase of common stock previously unreported by the reporting person."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F3","text":"Represents shares of common stock owned directly by BKF Holdings.  BKF Holdings is wholly owned by BKF Capital.  Steven N. Bronson, as the Chairman, CEO and majority shareholder of BKF Capital and the CEO of BKF Holdings, may be deemed to be the beneficial owner of the shares of Qualstar Corporation held by BKF Holdings."}],"balance_after":664881,"source":{"system":"sec-edgar","filing":"0001104659-19-050440","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465919050440/a4.xml","form_type":"4"}},{"id":3420190,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2019-09-09T18:54:57.000Z","date":"2019-09-09","kind":"purchase","acquired":true,"shares":6043,"price":5.5694,"value":33655.8842,"ownership":{"direct":false,"nature":"By BKF Asset Holdings, Inc."},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. (\"BKF Capital\"), BKF Asset Holdings, Inc. (\"BKF Holdings\") and Steven N. Bronson (collectively, the \"Reporting Persons\"). Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents shares of common stock owned directly by BKF Holdings.  BKF Holdings is wholly owned by BKF Capital.  Steven N. 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(''BKF Capital''), BKF Asset Holdings, Inc. (''BKF Holdings'') and Steven N. Bronson (collectively, the ''Reporting Persons''). Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents shares of common stock owned directly by BKF Holdings.  BKF Holdings is wholly owned by BKF Capital.  Steven N. 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(''BKF Capital''), BKF Asset Holdings, Inc. (''BKF Holdings'') and Steven N. Bronson (collectively, the ''Reporting Persons''). Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Represents shares of common stock owned directly by BKF Holdings.  BKF Holdings is wholly owned by BKF Capital.  Steven N. 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Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."}],"balance_after":4171140,"source":{"system":"sec-edgar","filing":"0001104659-18-053712","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465918053712/a4.xml","form_type":"4"}},{"id":3844396,"issuer":{"id":6861,"kind":"organization","name":"INTERLINK ELECTRONICS INC"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-08-15T17:48:42.000Z","date":"2018-08-15","kind":"purchase","acquired":true,"shares":497,"price":3.5,"value":1739.5,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. 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Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."}],"balance_after":4168106,"source":{"system":"sec-edgar","filing":"0001104659-18-052312","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465918052312/a4.xml","form_type":"4"}},{"id":3844395,"issuer":{"id":6861,"kind":"organization","name":"INTERLINK ELECTRONICS INC"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-08-15T17:48:42.000Z","date":"2018-08-14","kind":"purchase","acquired":true,"shares":469,"price":3.45,"value":1618.05,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. 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Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."}],"balance_after":4167609,"source":{"system":"sec-edgar","filing":"0001104659-18-052312","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465918052312/a4.xml","form_type":"4"}},{"id":3844394,"issuer":{"id":6861,"kind":"organization","name":"INTERLINK ELECTRONICS INC"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-08-15T17:48:42.000Z","date":"2018-08-13","kind":"purchase","acquired":true,"shares":21875,"price":3.4962,"value":76479.375,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. 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The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and the prices at which the transaction was effected."}],"balance_after":4167140,"source":{"system":"sec-edgar","filing":"0001104659-18-052312","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465918052312/a4.xml","form_type":"4"}},{"id":4125793,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-12-20T19:06:39.000Z","date":"2017-12-20","kind":"purchase","acquired":true,"shares":3518,"price":7.9514,"value":27973.0252,"ownership":{"direct":false,"nature":"By Mr. Bronson's spouse."},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. 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The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":10000,"source":{"system":"sec-edgar","filing":"0001104659-17-074375","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465917074375/a4.xml","form_type":"4"}},{"id":4125792,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-12-20T19:06:39.000Z","date":"2017-12-20","kind":"purchase","acquired":true,"shares":1482,"price":7.8,"value":11559.6,"ownership":{"direct":false,"nature":"By Mr. Bronson's spouse."},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. 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Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."}],"balance_after":6482,"source":{"system":"sec-edgar","filing":"0001104659-17-074375","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465917074375/a4.xml","form_type":"4"}},{"id":4125791,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-12-20T19:06:39.000Z","date":"2017-12-18","kind":"purchase","acquired":true,"shares":5000,"price":7.6,"value":38000.0,"ownership":{"direct":false,"nature":"By Mr. Bronson's spouse."},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. 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Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."}],"balance_after":5000,"source":{"system":"sec-edgar","filing":"0001104659-17-074375","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465917074375/a4.xml","form_type":"4"}},{"id":4125790,"issuer":{"id":150845,"kind":"organization","name":"QUALSTAR CORP","symbol":"QBAK"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-12-20T19:06:39.000Z","date":"2017-12-18","kind":"purchase","acquired":true,"shares":5000,"price":7.5,"value":37500.0,"ownership":{"direct":true},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. 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Each of the Reporting Persons disclaims beneficial ownership of the shares of common stock reported herein except to the extent of his or its pecuniary interest therein."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F4","text":"This Form 4 reflects a one-for-six reverse split of the Reporting Person's common stock which became effective on June 4, 2016."}],"balance_after":14617,"source":{"system":"sec-edgar","filing":"0001104659-17-074375","document":"a4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/9235/000110465917074375/a4.xml","form_type":"4"}},{"id":4132888,"issuer":{"id":6861,"kind":"organization","name":"INTERLINK ELECTRONICS INC"},"owners":[{"id":91790,"kind":"person","name":"BRONSON STEVEN N","position":1,"cik":"0001000383","reported_name":"BRONSON STEVEN N","relationship":{"director":true,"officer":true,"ten_percent_owner":true,"other":false,"officer_title":"COB, CEO, President"}},{"id":13397,"kind":"organization","name":"BKF CAPITAL GROUP INC","symbol":"BKF","position":2,"cik":"0000009235","reported_name":"BKF CAPITAL GROUP INC","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":146019,"kind":"organization","name":"BKF Asset Holdings, Inc.","position":3,"cik":"0001626686","reported_name":"BKF Asset Holdings, Inc.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-12-14T18:55:44.000Z","date":"2017-12-12","kind":"purchase","acquired":true,"shares":102,"price":5.1,"value":520.2,"ownership":{"direct":false,"nature":"By BKF Asset Holdings, Inc."},"footnotes":[{"field":"security","element":"securityTitle","label":"F1","text":"This Form 4 is filed jointly by BKF Capital Group, Inc. 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