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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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