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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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