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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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