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Note 15 - Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Income taxes computed at statutory rates, amount | $ 8,183 | $ 9,609
Income taxes computed at statutory rates, percent | (21.00%) | (21.00%)
Change in valuation allowance, amount | $ (9,319) | $ (11,716)
Change in valuation allowance, percent | 24.00% | 26.00%
NOL surrendered for refundable tax credit | $ (1,355) | $ (1,607)
NOL surrendered for refundable tax credit | 4.00% | 4.00%
Foreign research deductions and credits | $ 650 | $ 803
Foreign research deductions and credits, percent | (2.00%) | (2.00%)
Federal and state research and experimentation credits, amount | $ 1,288 | $ 1,412
Federal and state research and experimentation credits, percent | (3.00%) | (3.00%)
State income taxes, net of federal tax benefit, amount | $ (139) | $ 468
State income taxes, net of federal tax benefit, percent | 0.00% | (1.00%)
Other, amount | $ 648 | $ 827
Other, percent | (2.00%) | (3.00%)
Total | $ (44) | $ (204)
Total, percent | 0.00% | 0.00%

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