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Note 5 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Common stock, shares outstanding (in shares) | 50,852,297 | 51,461,472 | 52,759,223
Total (in shares) | 51,348,818 |  | 53,512,262
Restricted Stock Units and Stock Options [Member] |  |  |
Common stock shares reserved (in shares) | 347,362 |  | 582,908
New Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 76,175 |  | 81,244
GulfMark Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 72,984 |  | 88,887

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