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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Common stock, shares outstanding (in shares) | 52,487,862 | 52,259,303 | 50,895,235
Total (in shares) | 53,335,022 |  | 52,596,884
Restricted Stock Units and Stock Options [Member] |  |  |
Common stock shares reserved (in shares) | 689,806 |  | 1,520,226
New Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 76,175 |  | 81,244
GulfMark Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 81,179 |  | 100,179

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