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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Common stock, shares outstanding (in shares)	40,460,982	39,941,327	39,110,938
Total (in shares)	42,949,734		42,508,048
Restricted Stock Units (RSUs) [Member]
Common stock shares reserved (in shares)	797,330		766,867
New Creditor Warrants [Member]
Common stock shares reserved (in shares)	761,395		1,329,884
GulfMark Creditor Warrants [Member]
Common stock shares reserved (in shares)	930,027		1,300,359

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- Definition

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
-SubTopic 10
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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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-Topic 505
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