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Note 7 - Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Details |  |  |
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | $ 2,346 | $ 2,620 | $ 2,520
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 439 | 490 | 448
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount | 951 | 1,129 | 1,010
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount | (3) | (3) | (6)
Interest Income, Securities, Operating, Tax Exempt | (195) | 0 | 0
Adjustment To Deferred Tax Liability | 0 | 0 | 391
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | (84) | (50) | (90)
Provision for income taxes (note 7) | $ 3,454 | $ 4,186 | $ 4,273

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