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Note 6 - Stockholders' Equity and Dilutive Equity Instruments (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
(In Thousands) |  | Three Months Ended |
|  | June 30, 2022 |  |  | June 30, 2021 |
Balance at March 31, 2022 and 2021 |  | $ | 2,471 |  |  | $ | (875 | )
Unrealized loss on note receivable |  |  | (846 | ) |  |  | — |
Pension benefits recognized in OCI |  |  | 138 |  |  |  | (207 | )
Balance at June 30, 2022 and 2021 |  | $ | 1,763 |  |  | $ | (1,082 | )
(In Thousands) |  | Six Months Ended |
|  | June 30, 2022 |  |  | June 30, 2021 |
Balance at December 31, 2021 and 2020 |  | $ | 2,668 |  |  | $ | (804 | )
Unrealized loss on note receivable |  |  | (846 | ) |  |  | — |
Pension benefits recognized in OCI |  |  | (59 | ) |  |  | (278 | )
Balance at June 30, 2022 and 2021 |  | $ | 1,763 |  |  | $ | (1,082 | )
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, 2022 |  |  | June 30, 2021 |
Common shares outstanding |  |  | 42,029,882 |  |  |  | 41,000,575 |
New creditor warrants (strike price $0.001 per common share) |  |  | 395,401 |  |  |  | 639,354 |
GulfMark creditor warrants (strike price $0.01 per common share) |  |  | 309,351 |  |  |  | 669,601 |
SPO acquisition warrants (strike price $0.001 per common share) (A) |  |  | 8,100,000 |  |  |  | — |
Restricted stock units and stock options |  |  | 1,627,083 |  |  |  | 1,623,635 |
Total |  |  | 52,461,717 |  |  |  | 43,933,165 |

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