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Note 5 - Stockholders' Equity and Dilutive Equity Instruments (Tables) | 3 Months Ended
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Mar. 31, 2021
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Three Months Ended |
|  | March 31, |  |  | March 31, |
(In thousands) |  | 2021 |  |  | 2020 |
Balance at December 31, 2020 and 2019 |  | $ | (804 | ) |  | $ | (236 | )
Pension benefits recognized in OCI |  |  | (71 | ) |  |  | 369 |
Balance at March 31, 2021 and 2020 |  | $ | (875 | ) |  | $ | 133 |
Schedule of Total Shares Outstanding Including Warrants and Restricted Stock Units [Table Text Block] |
Total shares outstanding including warrants and restricted stock units |  | March 31, 2021 |  |  | March 31, 2020 |
Common shares outstanding |  |  | 40,731,777 |  |  |  | 40,259,917 |
New creditor warrants (strike price $0.001 per common share) |  |  | 657,203 |  |  |  | 821,308 |
GulfMark creditor warrants (strike price $0.01 per common share) |  |  | 815,575 |  |  |  | 952,154 |
Restricted stock units and stock options |  |  | 1,698,719 |  |  |  | 359,977 |
Total |  |  | 43,903,274 |  |  |  | 42,393,356 |

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