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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Common stock, shares outstanding (in shares) | 49,562,017 | 51,461,472 | 52,322,461
Total (in shares) | 50,237,731 |  | 53,171,525
Restricted Stock Units and Stock Options [Member] |  |  |
Common stock shares reserved (in shares) | 600,759 |  | 695,576
New Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 21,400 |  | 76,175
GulfMark Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 53,555 |  | 77,313

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