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Note 5 - Stockholders' Equity and Dilutive Equity Instruments (Tables) | 9 Months Ended
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Sep. 30, 2020
Notes Tables |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] |
|  | Three Months Ended |
|  | September 30, |  |  | September 30, |
(In thousands) |  | 2020 |  |  | 2019 |
Balance at June 30, 2020 and 2019 |  | $ | 581 |  |  | $ | 2,194 |
Pension benefits recognized in AOCI |  |  | 525 |  |  |  | — |
Balance at September 30, 2020 and 2019 |  | $ | 1,106 |  |  | $ | 2,194 |
|  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
(In thousands) |  | 2020 |  |  | 2019 |
Balance at December 31, 2019 and 2018 |  | $ | (236 | ) |  | $ | 2,194 |
Pension benefits recognized in AOCI |  |  | 1,342 |  |  |  | — |
Balance at September 30, 2020 and 2019 |  | $ | 1,106 |  |  | $ | 2,194 |
Schedule of Total Shares Outstanding Including Warrants and Restricted Stock Units [Table Text Block] |
Total shares outstanding including warrants and restricted stock units |  | September 30, 2020 |  |  | September 30, 2019 |
Common shares outstanding |  |  | 40,460,982 |  |  |  | 39,110,938 |
New creditor warrants (strike price $0.001 per common share) |  |  | 761,395 |  |  |  | 1,329,884 |
GulfMark creditor warrants (strike price $0.01 per common share) |  |  | 930,027 |  |  |  | 1,300,359 |
Restricted stock units |  |  | 797,330 |  |  |  | 766,867 |
Total |  |  | 42,949,734 |  |  |  | 42,508,048 |

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