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Note 4 - Debt (Details Textual) $ in Thousands, € in Millions |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 05, 2023 USD ($) | Nov. 16, 2021 USD ($) | Jan. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jan. 31, 2025 EUR (€) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 USD ($) | Jul. 03, 2023 USD ($)
Long-Term Debt, Current Maturities |  |  |  | $ 65,386 |  |  | $ 103,077 |
Restricted Cash, Current |  |  |  | $ 2,032 |  |  | 1,241 |
Alucat Crew Boats [Member] |  |  |  |  |  |  |  |
Number of Vessels |  |  |  | 8 |  |  |  |
Subsequent Event [Member] | Alucat Crew Boats [Member] |  |  |  |  |  |  |  |
Number of Vessels |  |  | 5 |  |  |  |  |
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 Aggregate Nominal Amount Outstanding |  | $ 75,000 |  |  |  |  |  |
Prime Rate [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 4.00% |  |  |  |  |  |
Nordic Bond [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 175,000 |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure |  |  |  | $ 180,800 |  |  | 181,700 |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.50% |  |  |  |  |  |
Debt Instrument, Issue Price Percentage |  | 98.50% |  |  |  |  |  |
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% |  |  |  |  |  |
Restricted Cash, Current |  |  |  | 1,200 |  |  |  |
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] |  |  |  |  |  |  |  |
Long-Term Debt, Gross |  |  |  | $ 175,000 |  |  | $ 175,000 |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.00% |  | 8.50% |  | 8.50% | 8.50% |
Supplier Facility Agreements for Four Vessels Delivered [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 15,200 |  | € 13.9 |  |
Supplier Facility Agreements for Four Vessels Delivered [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 2.70% |  | 2.70% |  |
Supplier Facility Agreements for Four Vessels Delivered [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 6.30% |  | 6.30% |  |
Supplier Facility Agreements for Five Vessels Delivered [Member] | Subsequent Event [Member] | Alucat Crew Boats [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 9,700 |  | € 9.4 |  |  |
Supplier Facility Agreements for Five Vessels Delivered [Member] | Minimum [Member] | Subsequent Event [Member] | Alucat Crew Boats [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.20% |  | 5.20% |  |  |
Supplier Facility Agreements for Five Vessels Delivered [Member] | Maximum [Member] | Subsequent Event [Member] | Alucat Crew Boats [Member] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.40% |  | 5.40% |  |  |
Secured Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 325,000 |  |  |  |  |  |  |
Long-Term Debt, Gross | 318,300 |  |  | $ 212,500 |  |  | $ 312,500 |
Debt Instrument, Covenant, Free Liquidity Test, Amount | $ 20,000 |  |  |  |  |  |  |
Debt Instrument, Covenant, Free Liquidity Test, Percentage | 10.00% |  |  |  |  |  |  |
Debt Instrument, Covenant, Minimum Equity Ratio | 30.00% |  |  |  |  |  |  |
Debt Instrument, Fair Value Disclosure |  |  |  | 218,200 |  |  | 313,700 |
Secured Debt [Member] | Tranche A Term Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 100,000 |  |  |  |  |  |  |
Long-Term Debt, Current Maturities | 50,000 |  |  |  |  |  |  |
Long-Term Line of Credit, Noncurrent | $ 50,000 |  |  |  |  |  |  |
Secured Debt [Member] | Tranche A Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 5.00% |  |  |  |  |  |  |
Secured Debt [Member] | Tranche A Term Loan [Member] | Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 8.00% |  |  |  |  |  |  |
Secured Debt [Member] | Tranche B Term Loan [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 225,000 |  |  |  |  |  |  |
Debt Instrument, Term (Year) | 3 years |  |  |  |  |  |  |
Debt Instrument, Final Payment | $ 50,000 |  |  |  |  |  |  |
Secured Debt [Member] | Tranche B Term Loan [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 3.75% |  |  |  |  |  |  |
Secured Debt [Member] | Tranche B Term Loan [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment | $ 12,500 |  |  |  |  |  |  |
Secured Debt [Member] | Tranche B Term Loan [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment | $ 25,000 |  |  |  |  |  |  |
Unsecured Debt [Member] |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  | $ 250,000
Long-Term Debt, Gross |  |  |  | 250,000 |  |  | 250,000 | 243,100
Debt Instrument, Covenant, Free Liquidity Test, Amount |  |  |  |  |  |  |  | $ 20,000
Debt Instrument, Covenant, Free Liquidity Test, Percentage |  |  |  |  |  |  |  | 10.00%
Debt Instrument, Covenant, Minimum Equity Ratio |  |  |  |  |  |  |  | 30.00%
Debt Instrument, Fair Value Disclosure |  |  |  | $ 266,100 |  |  | $ 260,200 |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 10.375% |  | 10.375% | 10.375% | 10.375%

X
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69B -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 69C -Publisher FASB -URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1D -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-10 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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