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Note 12 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Provision at federal statutory tax rate                         $ 2,989 $ 2,872 $ 2,486
State income tax-net of federal tax benefit                         301 266 85
Tax-exempt interest income                         (709) (608) (476)
Bank-owned life insurance income                         (42) (46) (44)
Captive insurance net premiums                         (169) (200) (200)
Investment in tax credit entities                         (63) (58) (117)
Other                         13 14 (42)
Totals $ 804 $ 669 $ 447 $ 400 $ 529 $ 596 $ 497 $ 618 $ 485 $ 413 $ 405 $ 389 $ 2,320 $ 2,240 $ 1,692
Effective tax rate                         16.30% 16.40% 14.30%