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Note 8 - Debt (Details Textual) $ in Thousands, € in Millions | Jul. 05, 2023 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2025 EUR (€) | Dec. 31, 2024 USD ($) | Jul. 03, 2023 USD ($) | Nov. 16, 2021 USD ($)
--- | --- | --- | --- | --- | --- | ---
Restricted Cash, Current |  | $ 5,234 |  | $ 2,032 |  |
Long-Term Debt, Current Maturities |  | 80,042 |  | 65,386 |  |
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration] | Secured Overnight Financing Rate (SOFR) [Member] |  |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | 25,000 |  |  |  |
Long-Term Line of Credit |  | 0 |  |  |  |
Nordic Bond [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 8.50%
Debt Instrument, Face Amount |  |  |  |  |  | $ 175,000
Debt Instrument, Covenant, Prepayment Premium Percentage |  |  |  |  |  | 2.55%
Debt Instrument, Covenant, Prepayment Premium Percentage, Increase (Decrease) |  |  |  |  |  | (0.85%)
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%
Nordic Bond [Member] | GOLP and TMII [Member] |  |  |  |  |  |
Debt Instrument, Collateral, Percentage of Equity Interests |  |  |  |  |  | 66.00%
Vessel Facility Agreements [Member] | Delivery of Vessels Per Arrangement [Member] |  |  |  |  |  |
Debt Instrument, Face Amount |  | $ 24,900 | € 23.3 |  |  |
Vessel Facility Agreements [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.70% | 2.70% |  |  |
Vessel Facility Agreements [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 6.30% | 6.30% |  |  |
Secured Debt [Member] |  |  |  |  |  |
Long-Term Debt, Fair Value |  | $ 205,400 |  | 218,200 |  |
Debt Instrument, Face Amount | $ 325,000 |  |  |  |  |
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% |  |  |  |  |
Secured Debt [Member] | Tranche A Term Loan [Member] |  |  |  |  |  |
Long-Term Debt, Current Maturities | $ 50,000 |  |  |  |  |
Long-Term Line of Credit, Noncurrent | $ 50,000 |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 5.00% |  |  |  |  |
Secured Debt [Member] | Tranche A Term Loan [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate | 8.00% |  |  |  |  |
Secured Debt [Member] | Tranche B Term Loan [Member] |  |  |  |  |  |
Debt Instrument, Term (Year) | 3 years |  |  |  |  |
Debt Instrument, Final Payment | $ 50,000 |  |  |  |  |
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] |  |  |  |  |  |
Long-Term Debt, Fair Value |  | $ 267,500 |  | 266,100 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 10.375% | 10.375% |  | 10.375% |
Debt Instrument, Face Amount |  |  |  |  | $ 250,000 |
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, Covenant, Prepayment Premium Percentage |  |  |  |  | 6.00% |
Nordic Bond [Member] |  |  |  |  |  |
Long-Term Debt, Fair Value |  | $ 180,800 |  | $ 180,800 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 8.50% | 8.50% |  |  |
Restricted Cash, Current |  | $ 5,000 |  |  |  |

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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 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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- Definition Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt classified as current. Excludes lease obligation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References Reference 1: 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 2: 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 3: 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 4: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 28 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-28 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -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 Reference 9: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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