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Note 9 - Debt (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Restricted Cash, Current | $ 20,284 | $ 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 | 3,500 |
The 8.00% Senior Secured Notes due August 2022 [Member] |  |
Debt Instrument, Repurchased Face Amount | 11,800 |
Debt Instrument, Face Amount | $ 100 |
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 | $ 138,300 | 141,400
Troms Offshore Borrowings [Member] | Fair Value, Inputs, Level 2 [Member] | Troms Offshore [Member] |  |
Debt Instrument, Fair Value Disclosure, Total | $ 24,400 | $ 51,600
Debt, Weighted Average Interest Rate | 5.00% |

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