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Each RSU represents the right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Not applicable. Each RSU represents the right to receive one share of the Issuer's common stock upon vesting."}],"balance_after":5620,"derivative":{"underlying":"Common Stock","underlying_shares":5620},"source":{"system":"sec-edgar","filing":"0001084991-24-000068","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499124000068/primary_doc.xml","form_type":"4"}},{"id":1519557,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-05-13T23:12:25.000Z","date":"2024-05-09","kind":"grant","planned":false,"acquired":true,"shares":4735,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"This Form 4/A amends Table 1 of the Form 4 filed as of the same date hereof.  The initial filing inadvertently reported 9,470 shares acquired in connection with the vesting of restricted stock units.  As provided under the RSU award agreement, the reporting person elected to take part cash in connection with the vesting of the RSUs. Thus, the actual number of shares of common stock acquired was 4,735 shares."}],"balance_after":40991,"source":{"system":"sec-edgar","filing":"0001084991-24-000039","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499124000039/primary_doc.xml","form_type":"4/A","original_submission_date":"2024-05-13"}},{"id":1519552,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2024-05-13T18:12:15.000Z","date":"2024-05-09","kind":"exercise","planned":false,"acquired":false,"shares":9470,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F2","text":"Not Applicable.  Each RSU represented the right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"Not Applicable.  Each RSU represented the right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"Not Applicable.  Each RSU represented the right to receive one share of the Issuer's common stock upon vesting."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":9470},"source":{"system":"sec-edgar","filing":"0001084991-24-000035","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499124000035/primary_doc.xml","form_type":"4"}},{"id":1519551,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2024-05-13T18:12:15.000Z","date":"2024-05-13","kind":"grant","planned":false,"acquired":true,"shares":9470,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Not Applicable.  The reported shares were acquired in connection with the vesting of a restricted stock unit award."}],"balance_after":45726,"source":{"system":"sec-edgar","filing":"0001084991-24-000035","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499124000035/primary_doc.xml","form_type":"4"}},{"id":1897152,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Unit","published_at":"2023-05-11T20:06:44.000Z","date":"2023-05-09","kind":"grant","planned":false,"acquired":true,"shares":9470,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Not applicable. Each RSU represents the right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Not applicable. Each RSU represents the right to receive one share of the Issuer's common stock upon vesting."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Not applicable. Each RSU represents the right to receive one share of the Issuer's common stock upon vesting."}],"balance_after":9470,"derivative":{"underlying":"Common Stock","underlying_shares":9470},"source":{"system":"sec-edgar","filing":"0001084991-23-000050","document":"primary_doc.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499123000050/primary_doc.xml","form_type":"4"}},{"id":2288960,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2022-04-28T20:45:34.000Z","date":"2022-04-26","kind":"grant","acquired":true,"shares":4212,"price":11.87,"value":49996.44,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"1. The acquisition reflects an award of Restricted Stock pursuant to the Company's 2019 Equity Incentive Plan. The award vests on the first anniversary of the grant date, subject to accelerated vestingunder certain circumstances."}],"balance_after":36256,"source":{"system":"sec-edgar","filing":"0001084991-22-000027","document":"wf-form4_165117864181579.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499122000027/wf-form4_165117864181579.xml","form_type":"4"}},{"id":2776676,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-03-22T19:22:38.000Z","date":"2021-03-18","kind":"grant","acquired":true,"shares":5612,"price":8.91,"value":50002.92,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The acquisition reflects an award of Restricted Stock pursuant to the Company's 2019 Equity Incentive Plan. The award vests on the first anniversary of the grant date, subject to accelerated vesting under certain circumstances."}],"balance_after":32044,"source":{"system":"sec-edgar","filing":"0001084991-21-000012","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499121000012/primary_doc.xml","form_type":"4"}},{"id":3166736,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-04-30T21:20:25.000Z","date":"2020-04-28","kind":"grant","acquired":true,"shares":4432,"price":5.64,"value":24996.48,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The acquisition reflects an award of Restricted Stock pursuant to the Company's 2019 Equity Incentive Plan. The award vests on the first anniversary of the grant date, subject to accelerated vesting under certain circumstances."}],"balance_after":26432,"source":{"system":"sec-edgar","filing":"0001084991-20-000024","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499120000024/primary_doc.xml","form_type":"4"}},{"id":3501039,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-06-05T18:16:57.000Z","date":"2019-06-04","kind":"sale","acquired":false,"shares":1600,"price":14.98,"value":23968.0,"ownership":{"direct":true},"balance_after":22000,"source":{"system":"sec-edgar","filing":"0001084991-19-000038","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499119000038/primary_doc.xml","form_type":"4"}},{"id":3501038,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-06-05T18:16:57.000Z","date":"2019-06-04","kind":"sale","acquired":false,"shares":1756,"price":15.2,"value":26691.2,"ownership":{"direct":true},"balance_after":23600,"source":{"system":"sec-edgar","filing":"0001084991-19-000038","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499119000038/primary_doc.xml","form_type":"4"}},{"id":3569655,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-04-02T21:29:49.000Z","date":"2019-03-29","kind":"grant","acquired":true,"shares":5784,"price":17.29,"value":100005.36,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The acquisition of the 5,784 shares of common stock reflects an award of restricted stock pursuant to the Company's 2009 Restricted Stock/Unit Plan, as amended, and Independent Director Compensation Policy. The award vests in installments of 1,446 shares beginning on March 31, 2020, with additional 1,446 installments vesting on June 30, September 30 and December 31, 2020, although the award is also subject to accelerated vesting upon the death, disability or retirement of the recipient, or upon a change in control of the Company."}],"balance_after":25356,"source":{"system":"sec-edgar","filing":"0001084991-19-000021","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499119000021/primary_doc.xml","form_type":"4"}},{"id":3990388,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2018-03-19T17:20:48.000Z","date":"2018-03-15","kind":"grant","acquired":true,"shares":4072,"price":24.55,"value":99967.6,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The acquisition of the 4,072 shares of common stock reflects an award of restricted stock pursuant to the Company's 2009 Restricted Stock/Unit Plan, as amended, and Independent Director Compensation Policy. The award vests in installments of 1,018 shares beginning on March 31, 2019, with additional 1,018 installments vesting on June 30, September 30 and December 31, 2019, although the award is also subject to accelerated vesting upon the death, disability or retirement of the recipient, or upon a change in control of the Company."}],"balance_after":19572,"source":{"system":"sec-edgar","filing":"0001084991-18-000015","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499118000015/primary_doc.xml","form_type":"4"}},{"id":3996805,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2018-03-14T16:15:20.000Z","date":"2018-03-13","kind":"sale","acquired":false,"shares":1853,"price":27.35,"value":50679.55,"ownership":{"direct":true},"balance_after":15500,"source":{"system":"sec-edgar","filing":"0001084991-18-000014","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499118000014/primary_doc.xml","form_type":"4"}},{"id":3996804,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2018-03-14T16:15:20.000Z","date":"2018-03-13","kind":"sale","acquired":false,"shares":647,"price":27.11,"value":17540.17,"ownership":{"direct":true},"balance_after":17353,"source":{"system":"sec-edgar","filing":"0001084991-18-000014","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499118000014/primary_doc.xml","form_type":"4"}},{"id":4275498,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-06-21T18:07:55.000Z","date":"2017-06-20","kind":"sale","acquired":false,"shares":2540,"price":23.6,"value":59944.0,"ownership":{"direct":true},"balance_after":18000,"source":{"system":"sec-edgar","filing":"0001084991-17-000049","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499117000049/primary_doc.xml","form_type":"4"}},{"id":4371843,"issuer":{"id":1461,"kind":"organization","name":"NATURAL GAS SERVICES GROUP INC","symbol":"NGS"},"owners":[{"id":89848,"kind":"person","name":"BRADSHAW DAVID L","position":1,"cik":"0001231266","reported_name":"BRADSHAW DAVID L","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2017-03-27T20:23:36.000Z","date":"2017-03-23","kind":"grant","acquired":true,"shares":3992,"price":25.05,"value":99999.6,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The acquisition of the 3,992 shares of common stock reflects an award of restricted stock pursuant to the Company's 2009 Restricted Stock/Unit Plan, as amended, and Independent Director Compensation Policy.  The award vests in installments of 998 shares beginning on March 31, 2018, with additional 998 installments vesting on June 30, September 30 and December 31, 2018, although the award is also subject to accelerated vesting upon the death, disability or retirement of the recipient, or upon a change in control of the Company."}],"balance_after":20540,"source":{"system":"sec-edgar","filing":"0001084991-17-000022","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1084991/000108499117000022/primary_doc.xml","form_type":"4"}}]}