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Each DSU entitles the reporting person to receive one share of common stock following the reporting person's retirement or termination of service from the Board of Directors."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Comprised of shares of common stock to be issued upon settlement of DSUs."}],"balance_after":100621,"source":{"system":"sec-edgar","filing":"0001209191-22-041986","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1287808/000120919122041986/doc4.xml","form_type":"4"}},{"id":2675410,"issuer":{"id":121293,"kind":"organization","name":"Hill International, Inc.","symbol":"HIL"},"owners":[{"id":121299,"kind":"person","name":"Steele Susan M.","position":1,"cik":"0001780523","reported_name":"Steele Susan M.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-06-09T20:53:01.000Z","date":"2021-06-07","kind":"grant","acquired":true,"shares":28846,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Grant of deferred stock units (DSUs) for payment of part of annual retainer for service on the Issuer's Board of Directors. Each DSU entitles the reporting person to receive one share of common stock following the reporting person's retirement or termination of service from the Board of Directors."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Comprised of shares of common stock to be issued upon settlement of DSUs."}],"balance_after":100621,"source":{"system":"sec-edgar","filing":"0001209191-21-039345","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1287808/000120919121039345/doc4.xml","form_type":"4"}},{"id":2916341,"issuer":{"id":7369,"kind":"organization","name":"HARVARD BIOSCIENCE INC"},"owners":[{"id":121299,"kind":"person","name":"Steele Susan M.","position":1,"cik":"0001780523","reported_name":"Steele Susan M.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-01-06T22:54:09.000Z","date":"2021-01-04","kind":"grant","acquired":true,"shares":10800,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents a deferred stock award of 10,800 restricted stock units which vest quarterly in equal installments on March 31, 2021, June 30, 2021, September 30, 2021 and December 31, 2021 and are subject to continued service as a non-employee director on the applicable vesting dates. These retainer awards are granted in satisfaction of the annual retainer compensation to be earned by the director for her service on the Issuer's Board of Directors and its Committees during 2021. The number of shares of common stock subject to such retainer award is equal to the amount of cash that would have been received had the applicable retainer all been paid in cash, divided by the average daily closing price of the Issuer's common stock for the month of November, rounded to the nearest 100 shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) the award described in footnote (1) above, (b) an award of 28,100 restricted stock units that fully vest on the earlier to occur of (i) the date of the Issuer's next Annual Meeting of Stockholders after June 11, 2020, immediately prior to the commencement of such meeting, or (ii) June 18, 2021, and (c) 10,500 shares of common stock held by the Reporting Person."}],"balance_after":49400,"source":{"system":"sec-edgar","filing":"0000921895-21-000053","document":"form412799ste_01062021.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1123494/000092189521000053/form412799ste_01062021.xml","form_type":"4"}},{"id":3092618,"issuer":{"id":7369,"kind":"organization","name":"HARVARD BIOSCIENCE INC"},"owners":[{"id":121299,"kind":"person","name":"Steele Susan M.","position":1,"cik":"0001780523","reported_name":"Steele Susan M.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-07-02T23:07:38.000Z","date":"2020-07-01","kind":"grant","acquired":true,"shares":1300,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents an award of 1,300 restricted stock units that vests in two equal installments on each of September 30, 2020 and December 31, 2020. This retainer award was granted in lieu and satisfaction of the annual cash retainer compensation to be earned by the director in connection with her service as a member of the Compensation Committee of the Issuer's Board of Directors, which service commenced on June 11, 2020. The number of shares of common stock subject to such retainer award is equal to the amount of cash that would have been received had the applicable retainer all been paid in cash on a prorated basis, divided by the average daily closing market price of the Issuer's common stock for the month of April, rounded to the nearest 100 shares."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) the award described in footnote (1) above, (b) an award of 28,100 restricted stock units vesting on the earlier to occur of (i) the date of the Issuer's next Annual Meeting of Stockholders or (ii) June 18, 2021, (c) an award of 6,133 remaining unvested restricted stock units vesting in equal quarterly installments on September 30, 2020 and December 31, 2020, and (d) 3,067 shares of common stock held by the Reporting Person."}],"balance_after":38600,"source":{"system":"sec-edgar","filing":"0001209191-20-040689","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1123494/000120919120040689/doc4.xml","form_type":"4"}},{"id":3104493,"issuer":{"id":7369,"kind":"organization","name":"HARVARD BIOSCIENCE INC"},"owners":[{"id":121299,"kind":"person","name":"Steele Susan M.","position":1,"cik":"0001780523","reported_name":"Steele Susan M.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-06-19T21:11:24.000Z","date":"2020-06-18","kind":"grant","acquired":true,"shares":28100,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents an award of 28,100 restricted stock units that fully vest on the earlier to occur of (i) the date of the Issuer's next Annual Meeting of Stockholders after June 11, 2020, immediately prior to the commencement of such meeting, and (ii) June 18, 2021."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes (a) the award described in footnote (1) above and (b) an award of 9,200 restricted stock units vesting in equal quarterly installments on June 30, 2020, September 30, 2020 and December 31, 2020."}],"balance_after":37300,"source":{"system":"sec-edgar","filing":"0001209191-20-037989","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1123494/000120919120037989/doc4.xml","form_type":"4"}},{"id":3114527,"issuer":{"id":121293,"kind":"organization","name":"Hill International, Inc.","symbol":"HIL"},"owners":[{"id":121299,"kind":"person","name":"Steele Susan M.","position":1,"cik":"0001780523","reported_name":"Steele Susan M.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2020-06-10T17:25:57.000Z","date":"2020-06-04","kind":"grant","acquired":true,"shares":44910,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Grant of deferred stock units (DSUs) for payment of part of annual retainer for service during 2020-2021 on the Issuer's Board of Directors. 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