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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Common stock, shares outstanding (in shares) | 41,716,885 | 41,307,617 | 40,731,777
Total (in shares) | 44,348,132 |  | 43,903,274
Restricted Stock Units and Stock Options [Member] |  |  |
Common stock shares reserved (in shares) | 1,736,037 |  | 1,698,719
New Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 465,398 |  | 657,203
GulfMark Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 429,812 |  | 815,575

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