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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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