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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Common stock, shares outstanding (in shares)	41,277,377	40,704,984	40,460,982
Total (in shares)	43,926,152		42,949,734
Restricted Stock Units and Stock Options [Member]
Common stock shares reserved (in shares)	1,447,957		797,330
New Creditor Warrants [Member]
Common stock shares reserved (in shares)	635,663		761,395
GulfMark Creditor Warrants [Member]
Common stock shares reserved (in shares)	565,155		930,027

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The number of shares outstanding and the aggregate number of common shares reserved for future issuance.

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Aggregate number of common shares reserved for future issuance.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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