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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Common stock, shares outstanding (in shares)	41,000,575	40,704,984	40,335,963
Total (in shares)	43,933,165		42,738,204
Restricted Stock Units and Stock Options [Member]
Common stock shares reserved (in shares)	1,623,635		632,345
New Creditor Warrants [Member]
Common stock shares reserved (in shares)	639,354		817,742
GulfMark Creditor Warrants [Member]
Common stock shares reserved (in shares)	669,601		952,154

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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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-Topic 210
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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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