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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | ---
Common stock, shares outstanding (in shares) | 52,322,461 | 52,259,303 | 52,839,862
Total (in shares) | 53,171,525 |  | 54,522,460
Restricted Stock Units and Stock Options [Member] |  |  |
Common stock shares reserved (in shares) | 695,576 |  | 1,505,519
New Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 76,175 |  | 81,244
GulfMark Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 77,313 |  | 95,835

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