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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, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
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, 2023
Dec. 31, 2022
Dec. 31, 2021
Provision at federal statutory tax rate                         $ 3,161 $ 2,989 $ 2,872
State income tax-net of federal tax benefit                         178 301 266
Tax-exempt interest income                         (733) (709) (608)
Bank-owned life insurance income                         (43) (42) (46)
Captive insurance net premiums                         (126) (169) (200)
Investment in tax credit entities                         (228) (63) (58)
Other                         39 13 14
Totals $ 478 $ 572 $ 429 $ 769 $ 804 $ 669 $ 447 $ 400 $ 529 $ 596 $ 497 $ 618 $ 2,248 $ 2,320 $ 2,240
Effective tax rate                         14.90% 16.30% 16.40%