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Note 3 - Debt (Details Textual) $ in Thousands, kr in Millions |  | 1 Months Ended | 12 Months Ended | 36 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 16, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 NOK (kr) | Nov. 30, 2020 USD ($) | Nov. 30, 2019 USD ($) | Jul. 31, 2017 USD ($)
Gain (Loss) on Extinguishment of Debt, Total |  |  | $ (11,100) | $ 0 | $ 0 |  |  |  |  |
Restricted Cash, Current |  | $ 2,079 | 1,240 | 2,079 |  |  |  |  |  |
Troms Offshore [Member] | Senior Notes [Member] | Plan Of Reorganization [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Obligation to Prepay, Additional Amount, Maximum |  | 45,000 |  | $ 45,000 |  |  |  |  |  |
Repayments of Long-term Debt, Total |  | $ 12,500 | 23,300 |  |  |  |  |  |  |
Tender Offer [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  |  | $ 125,000 |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  |  | $ 135,600 |
Premium Paid On Debt Repurchase |  |  |  |  |  |  |  |  | 8.50% |
Cost Associated With Debt Modification |  |  |  |  |  |  |  |  | $ 11,400 |
Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 25,000 |  |  |  |  |  |  |  |  |
Long-term Line of Credit, Total |  |  | 0 |  |  |  |  |  |  |
Debt Instrument, Mandatory Prepayment, Minimum Vessel Collateral | 75,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Mandatory Prepayment, Minimum Aggregate Nominal Amount Outstanding | $ 75,000 |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | Prime Rate [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 4.00% |  |  |  |  |  |  |  |  |
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 4.00% |  |  |  |  |  |  |  |  |
Nordic Bond [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 175,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Issue Price Percentage | 98.50% |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.50% |  |  |  |  |  |  |  |  |
Debt Instrument, Option to Issue Additional Amount | $ 25,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Monthly Deposit into Reserve Account, Percentage of Interest Payment | 16.67% |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Minimum Free Liquidity Amount | $ 20,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Minimum Free Liquidity, Percentage of Net Interest Bearing Debt | 10.00% |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant, Percentage of Minimum Equity Ratio | 30.00% |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value |  |  | 177,600 |  |  |  |  |  |  |
Nordic Bond [Member] | GOLP and TMII [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Collateral, Percentage of Equity Interests | 66.00% |  |  |  |  |  |  |  |  |
The 8.00% Senior Secured Notes due August 2022 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 350,000
Debt Instrument, Interest Rate, Stated Percentage | 8.00% | 8.00% |  | 8.00% |  |  |  |  |  | 8.00%
Gain (Loss) on Extinguishment of Debt, Total | $ (11,100) |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  | $ 11,800 | $ 27,700 |  |  |  |  |  |
Debt Instrument, Repurchased Face Amount |  |  |  |  |  |  |  | $ 50,000 |  |
Debt Instrument, Repurchase Amount |  |  |  |  |  |  |  | $ 50,300 |  |
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 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 8.50% |  |  |  |  |  |  |
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | $ 60,800 |  |  |  |
Debt Instrument, Term (Year) |  |  |  |  |  | 12 years |  |  |  |
Long-term Debt, Total |  | $ 50,900 |  | $ 50,900 |  |  |  |  |  |
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Capitalization Rate |  |  |  |  |  | 4.56% |  |  |  |
USD Denominated Notes Due January 2027 [Member] | Troms Offshore [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Capitalization Rate |  |  |  |  |  | 6.13% |  |  |  |

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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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