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Note 8 - Income Taxes - Reconciliation of Income Tax Expense By Applying the Statutory Federal Rate (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income taxes at statutory rate $ 7,822 $ 6,562 $ 9,485
State and local income taxes, net of federal tax benefit 898 711 803
Tax credits (1,052) (808) (898)
Uncertain tax positions (26) 42 164
Valuation allowance (86) 0 71
Other (159) (449) (274)
Income tax expense $ 7,397 $ 6,058 $ 9,351