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Note 9 - Debt (Details Textual) - USD ($) $ in Thousands |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 08, 2021 | Sep. 30, 2021 | Nov. 16, 2021 | Dec. 31, 2020
Restricted Cash, Current |  | $ 24,092 |  | $ 2,079
Troms Offshore [Member] | Senior Notes [Member] | Plan Of Reorganization [Member] |  |  |  |
Debt Instrument, Covenant, Obligation to Prepay, Additional Amount, Maximum |  | 45,000 |  |
Repayments of Long-term Debt, Total |  | 23,300 |  |
Long-Term Debt, Maturity, Remainder of Fiscal Year |  | 3,400 |  |
The 8.00% Senior Secured Notes due August 2022 [Member] |  |  |  |
Debt Instrument, Repurchased Face Amount |  | 11,800 |  |
Debt Instrument, Face Amount |  | $ 100 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% |  | 8.00%
The 8.00% Senior Secured Notes due August 2022 [Member] | Tender Offer [Member] |  |  |  |
Percentage Of Proceeds From Asset Sales Net Of Commission Paid |  | 65.00% |  |
The 8.00% Senior Secured Notes due August 2022 [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Debt Instrument, Fair Value Disclosure, Total |  | $ 136,400 |  | $ 141,400
Troms Offshore Borrowings [Member] | Fair Value, Inputs, Level 2 [Member] | Troms Offshore [Member] |  |  |  |
Debt Instrument, Fair Value Disclosure, Total |  | $ 23,600 |  | $ 51,600
Debt, Weighted Average Interest Rate |  | 5.00% |  |
Nordic Bond [Member] | Subsequent Event [Member] |  |  |  |
Debt Instrument, Face Amount | $ 175,000 |  |  |
Debt Instrument, Term (Year) | 5 years |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.50% |

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