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Note 6 - Stockholders' Equity and Dilutive Equity Instruments (Tables) | 9 Months Ended
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Sep. 30, 2022
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
(In Thousands) |  | Three Months Ended |
|  | September 30, 2022 |  |  | September 30, 2021 |
Balance at June 30, 2022 and 2021 |  | $ | 1,763 |  |  | $ | (1,082 | )
Unrealized loss on note receivable |  |  | (429 | ) |  |  | — |
Pension benefits recognized in OCI |  |  | 140 |  |  |  | (207 | )
Balance at September 30, 2022 and 2021 |  | $ | 1,474 |  |  | $ | (1,289 | )
(In Thousands) |  | Nine Months Ended |
|  | September 30, 2022 |  |  | September 30, 2021 |
Balance at December 31, 2021 and 2020 |  | $ | 2,668 |  |  | $ | (804 | )
Unrealized loss on note receivable |  |  | (1,275 | ) |  |  | — |
Pension benefits recognized in OCI |  |  | 81 |  |  |  | (485 | )
Balance at September 30, 2022 and 2021 |  | $ | 1,474 |  |  | $ | (1,289 | )
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 |  | September 30, 2022 |  |  | September 30, 2021 |
Common shares outstanding |  |  | 46,494,323 |  |  |  | 41,277,377 |
New creditor warrants (strike price $0.001 per common share) |  |  | 119,215 |  |  |  | 635,663 |
GulfMark creditor warrants (strike price $0.01 per common share) |  |  | 185,126 |  |  |  | 565,155 |
SPO acquisition warrants (strike price $0.001 per common share) (A) (B) (C) |  |  | 4,003,299 |  |  |  | — |
Restricted stock units and stock options |  |  | 1,619,132 |  |  |  | 1,447,957 |
Total |  |  | 52,421,095 |  |  |  | 43,926,152 |

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