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Note 5 - Stockholders' Equity and Dilutive Equity Instruments (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Three Months Ended |
(In thousands) |  | September 30, 2021 |  |  | September 30, 2020 |
Balance at June 30, 2021 and 2020 |  | $ | (1,082 | ) |  | $ | 581 |
Pension benefits recognized in OCI |  |  | (207 | ) |  |  | 525 |
Balance at September 30, 2021 and 2020 |  | $ | (1,289 | ) |  | $ | 1,106 |
|  | Nine Months Ended |
(In thousands) |  | September 30, 2021 |  |  | September 30, 2020 |
Balance at December 31, 2020 and 2019 |  | $ | (804 | ) |  | $ | (236 | )
Pension benefits recognized in OCI |  |  | (485 | ) |  |  | 1,342 |
Balance at September 30, 2021 and 2020 |  | $ | (1,289 | ) |  | $ | 1,106 |
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, 2021 |  |  | September 30, 2020 |
Common shares outstanding |  |  | 41,277,377 |  |  |  | 40,460,982 |
New creditor warrants (strike price $0.001 per common share) |  |  | 635,663 |  |  |  | 761,395 |
GulfMark creditor warrants (strike price $0.01 per common share) |  |  | 565,155 |  |  |  | 930,027 |
Restricted stock units and stock options |  |  | 1,447,957 |  |  |  | 797,330 |
Total |  |  | 43,926,152 |  |  |  | 42,949,734 |

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