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Note 5 - Stockholders' Equity and Dilutive Equity Instruments (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
(In Thousands) |  | Three Months Ended |
|  | June 30, 2024 |  |  | June 30, 2023 |
Balance at March 31, 2024 and 2023 |  | $ | 5,209 |  |  | $ | 8,254 |
Unrealized gain (loss) on note receivable |  |  | 73 |  |  |  | (184 | )
Pension benefits recognized in OCI |  |  | (220 | ) |  |  | (3,504 | )
Balance at June 30, 2024 and 2023 |  | $ | 5,062 |  |  | $ | 4,566 |
(In Thousands) |  | Six Months Ended |
|  | June 30, 2024 |  |  | June 30, 2023 |
Balance at December 31, 2023 and 2022 |  | $ | 5,266 |  |  | $ | 8,576 |
Unrealized gain (loss) on note receivable |  |  | 153 |  |  |  | (316 | )
Pension benefits recognized in OCI |  |  | (357 | ) |  |  | (3,694 | )
Balance at June 30, 2024 and 2023 |  | $ | 5,062 |  |  | $ | 4,566 |
Schedule of Total Shares Outstanding Including Warrants and Restricted Stock Units [Table Text Block] |
Total shares outstanding including warrants, restricted stock units and stock options |  | June 30, 2024 |  |  | June 30, 2023 |
Common shares outstanding |  |  | 52,487,862 |  |  |  | 50,895,235 |
New creditor warrants (strike price $0.001 per common share) |  |  | 76,175 |  |  |  | 81,244 |
GulfMark creditor warrants (strike price $0.01 per common share) |  |  | 81,179 |  |  |  | 100,179 |
Restricted stock units and stock options |  |  | 689,806 |  |  |  | 1,520,226 |
Total |  |  | 53,335,022 |  |  |  | 52,596,884 |

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