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Note 4 - Indebtedness (Details Textual) $ in Thousands, kr in Millions | 1 Months Ended | 12 Months Ended | 36 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 NOK (kr) | Nov. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Nov. 30, 2019 USD ($) | Jan. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Feb. 28, 2018 USD ($) | Jul. 31, 2017
Restricted Cash, Current | $ 2,079 | $ 2,079 | $ 5,755 |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  | 0 | $ 0 | $ (8,119) |  |  |  |  |  |  |  |  |
Gulf Mark Offshore Inc [Member] | Gulf Mark Term Loan Facility [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  | 100,000 |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  | 8,100 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Troms Offshore [Member] | Plan Of Reorganization [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage Of Required Principal Payments Due From Effective Date |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%
Number Of Vessels Mortgaged |  |  |  |  |  |  |  |  |  |  |  |  | 6
Debt Instrument, Covenant, Obligation to Prepay, Additional Amount, Maximum | 45,000 | 45,000 |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term Debt, Total | 12,500 |  |  |  |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Troms Offshore [Member] | Plan Of Reorganization [Member] | Current Portion of long-term Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt, Maturity, Year One | 22,800 | 22,800 |  |  |  |  |  |  |  |  |  |  |
Tender Offer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  | $ 125,000 |  |  |  |
Premium Paid On Debt Repurchase |  |  |  |  |  |  |  |  | 8.50% |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  | $ 135,600 |  |  |  |
Cost Associated With Debt Modification |  |  |  |  |  |  |  |  | $ 11,400 |  |  |  |
Tender Offer [Member] | Senior Notes [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 25,400 |  |  |  |  |  |  |  | $ 24,700 |
The 8.00% Senior Secured Notes due August 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 350,000 | $ 350,000 |  |  |  |  |  |  |  | $ 100 | $ 40 |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.00% | 8.00% | 8.00% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  | $ 50,000 | $ 27,700 |  |  |  |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  | 50,300 |  |  |  |  |  |
Debt Instrument, Repurchase Premium (Discount) Amount |  |  |  |  |  |  | $ 600 |  |  |  |  |  |
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 | $ 141,400 | $ 141,400 |  |  |  |  |  |  |  |  |  |  |
NOK Denominated Notes Due May 2024 and January 2026 [Member] | Troms Offshore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  |  |  | 12 years |  |  |  |  |  |  |
NOK Denominated Notes Due January 2026 [Member] | Troms Offshore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | kr |  |  |  |  |  | kr 504.4 |  |  |  |  |  |  |
NOK Denominated Notes Due January 2026 [Member] | Fair Value, Inputs, Level 2 [Member] | Troms Offshore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure, Total | 14,789 | 14,789 | $ 20,792 |  |  |  |  |  |  |  |  |  |
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  | $ 60,800 |  |  |  |  |  |  |  |
Debt Instrument, Term (Year) |  |  |  |  | 12 years |  |  |  |  |  |  |  |
USD Denominated Notes Due January 2027 [Member] | Maximum [Member] | Troms Offshore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization Rate |  |  |  |  | 6.13% |  |  |  |  |  |  |  |
USD Denominated Notes Due January 2027 [Member] | Minimum [Member] | Troms Offshore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Capitalization Rate |  |  |  |  | 4.56% |  |  |  |  |  |  |  |
USD Denominated Notes Due January 2027 [Member] | Fair Value, Inputs, Level 2 [Member] | Troms Offshore [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure, Total | $ 15,040 | $ 15,040 | $ 20,278 |  |  |  |  |  |  |  |  |  |

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