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Note 7 - Income Tax - Reconciliation of Differences Between Expected Income Tax Expense Expressed as Accounting Profit Multiplied by Corporate Income Tax Rate and Actual Income Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |
Income before income taxes |  | $ 98,412 | $ 159,997 | $ 23,870
Tax using the Norwegian tax rate of 22% |  | $ (21,651) | $ (35,199) | $ (5,251)
Tax using the Norwegian tax rate of 22%, percentage | [1] | 22.00% | 22.00% | 22.00%
Different tax rates of subsidiaries operating in other jurisdictions |  | $ 7,945 | $ 5,346 | $ 1,408
Different tax rates of subsidiaries operating in other jurisdictions, percentage | [1] | (8.10%) | (3.30%) | (5.90%)
Changes in tax rates |  | $ 2 | $ (64) | $ 21
Change in tax rates, percentage | [1] | 0.00% | 0.00% | (0.10%)
Non-deductible expenses |  | $ (3,861) | $ (4,588) | $ (3,585)
Non-deductible expenses, percentage | [1] | 3.90% | 2.90% | 15.00%
Tax-exempt income |  | $ 2,986 | $ 23,149 | $ 480
Tax-exempt income, percentage | [1] | (3.00%) | (14.50%) | (2.00%)
Foreign withholding taxes |  | $ (138) | $ 270 | $ 299
Foreign withholding taxes, percentage | [1] | 0.10% | (0.20%) | (1.30%)
Recognition and derecognition of deferred tax assets |  | $ (1,554) | $ 4,848 | $ (2,027)
Recognition and derecognition of deferred tax assets, percentage | [1] | 1.60% | (3.00%) | 8.50%
Changes in estimates related to prior years |  | $ 48 | $ (67) | $ 549
Changes in estimates related to prior years, percentage | [1] | 0.00% | 0.00% | (2.30%)
Movements in exchange rates |  | $ (1,419) | $ (391) | $ (729)
Movements in exchange rates, percentage | [1] | 1.40% | 0.20% | 3.10%
Income tax expense |  | $ (17,642) | $ (6,697) | $ (8,835)
Income tax expense at effective tax rate | [1] | 17.90% | 4.20% | 37.00%
[1] | Percentages have been rounded for presentation purposes and may differ from unrounded results.

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