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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Common stock, shares outstanding (in shares)	40,731,777	40,704,984	40,259,917
Total (in shares)	43,903,274		42,393,356
Restricted Stock Units and Stock Options [Member]
Common stock shares reserved (in shares)	1,698,719		359,977
New Creditor Warrants [Member]
Common stock shares reserved (in shares)	657,203		821,308
GulfMark Creditor Warrants [Member]
Common stock shares reserved (in shares)	815,575		952,154

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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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