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Note 5 - Stockholders' Equity and Dilutive Equity Instruments (Tables) | 3 Months Ended
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Mar. 31, 2022
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
(In Thousands) |  | Three Months Ended |
|  | March 31, 2022 |  |  | March 31, 2021 |
Balance at December 31, 2021 and 2020 |  | $ | 2,668 |  |  | $ | (804 | )
Pension benefits recognized in OCI |  |  | (197 | ) |  |  | (71 | )
Balance at March 31, 2022 and 2021 |  | $ | 2,471 |  |  | $ | (875 | )
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 |  | March 31, 2022 |  |  | March 31, 2021 |
Common shares outstanding |  |  | 41,716,885 |  |  |  | 40,731,777 |
New creditor warrants (strike price $0.001 per common share) |  |  | 465,398 |  |  |  | 657,203 |
GulfMark creditor warrants (strike price $0.01 per common share) |  |  | 429,812 |  |  |  | 815,575 |
Restricted stock units and stock options |  |  | 1,736,037 |  |  |  | 1,698,719 |
Total |  |  | 44,348,132 |  |  |  | 43,903,274 |

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