Note 9 - Income Taxes - Reconciliation of Income Taxes at the Statutory Federal Income Tax Rate to the Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Federal tax provision at the statutory rate	$ 5,187	$ 3,887	$ 3,274
State income tax provision, net of federal benefit	710	528	975
Tax credits	(1,284)	(1,197)	(1,227)
Change in valuation allowance	52	3	51
Adjustments for prior year taxes	(36)	(19)	(261)
Changes in uncertain tax positions	160	167	767
Other	7	(71)	(85)
Provision for income taxes	$ 4,796	$ 3,298	$ 3,494