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Note 6 - Stockholders' Equity and Dilutive Equity Instruments (Tables) | 6 Months Ended
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Jun. 30, 2023
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
(In Thousands) |  | Three Months Ended |
|  | June 30, 2023 |  |  | June 30, 2022 |
Balance at March 31, 2023 and 2022 |  | $ | 8,254 |  |  | $ | 2,471 |
Unrealized loss on note receivable |  |  | (184 | ) |  |  | (846 | )
Pension benefits recognized in OCI |  |  | (3,504 | ) |  |  | 138 |
Balance at June 30, 2023 and 2022 |  | $ | 4,566 |  |  | $ | 1,763 |
(In Thousands) |  | Six Months Ended |
|  | June 30, 2023 |  |  | June 30, 2022 |
Balance at December 31, 2022 and 2021 |  | $ | 8,576 |  |  | $ | 2,668 |
Unrealized loss on note receivable |  |  | (316 | ) |  |  | (846 | )
Pension benefits recognized in OCI |  |  | (3,694 | ) |  |  | (59 | )
Balance at June 30, 2023 and 2022 |  | $ | 4,566 |  |  | $ | 1,763 |
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, 2023 |  |  | June 30, 2022 |
Common shares outstanding |  |  | 50,895,235 |  |  |  | 42,029,882 |
New creditor warrants (strike price $0.001 per common share) |  |  | 81,244 |  |  |  | 395,401 |
GulfMark creditor warrants (strike price $0.01 per common share) |  |  | 100,179 |  |  |  | 309,351 |
SPO acquisition warrants (strike price $0.001 per common share) |  |  | — |  |  |  | 8,100,000 |
Restricted stock units and stock options |  |  | 1,520,226 |  |  |  | 1,627,083 |
Total |  |  | 52,596,884 |  |  |  | 52,461,717 |

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