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Note 9 - Debt (Details Textual) - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Restricted Cash, Current |  | $ 9,061 | $ 2,079
Troms Offshore [Member] | Plan Of Reorganization [Member] |  |  |
Debt, Weighted Average Interest Rate |  | 5.00% |
Troms Offshore [Member] | Plan Of Reorganization [Member] | Senior Notes [Member] |  |  |
Debt Instrument, Covenant, Obligation to Prepay, Additional Amount, Maximum |  | $ 45,000 |
Repayments of Long-term Debt, Total | $ 13,200 |  |
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 |  | $ 134,200 | 141,400
Troms Offshore Borrowings [Member] | Fair Value, Inputs, Level 2 [Member] | Troms Offshore [Member] |  |  |
Debt Instrument, Fair Value Disclosure, Total |  | 36,300 | $ 51,600
Debt Obligation Prepayment Due in the Second Quarter of 2021 [Member] | Troms Offshore [Member] | Plan Of Reorganization [Member] | Senior Notes [Member] | Current Portion of long-term Debt [Member] |  |  |
Long-Term Debt, Maturity, Remainder of Fiscal Year |  | 9,700 |
Debt Obligation Prepayment Due in the Fourth Quarter of 2021 [Member] | Troms Offshore [Member] | Plan Of Reorganization [Member] | Senior Notes [Member] | Current Portion of long-term Debt [Member] |  |  |
Long-Term Debt, Maturity, Remainder of Fiscal Year |  | $ 3,400 |

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