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Note 6 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) - shares | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Common stock, shares outstanding (in shares) | 52,839,862 | 50,554,179 | 46,494,323
Total (in shares) | 54,522,460 |  | 52,421,095
Restricted Stock Units and Stock Options [Member] |  |  |
Common stock shares reserved (in shares) | 1,505,519 |  | 1,619,132
New Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 81,244 |  | 119,215
GulfMark Creditor Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 95,835 |  | 185,126
SPO Acquisition Warrants [Member] |  |  |
Common stock shares reserved (in shares) | 0 |  | 4,003,299

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