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Note 11 - Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Federal income tax expense at statutory rate | $ 15,517 | $ 6,139 | $ 9,946
State taxes, net of federal benefit | 2,295 | 762 | 1,445
Valuation allowance | (495) | (67) | (1,202)
Change in uncertain tax positions, net | 540 | 225 | 356
Research and development credit | (704) | (1,012) | (1,333)
Investment tax credit | 0 | (682) | 0
State rate change | (165) | 92 | (168)
Other | 752 | 54 | (292)
Income Tax Expense (Benefit) | $ 17,740 | $ 5,511 | $ 8,752

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