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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, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Provision at federal statutory tax rate                         $ 2,486 $ 2,588 $ 2,239
State income tax-net of federal tax benefit                         85 121 100
Tax-exempt interest income                         (476) (379) (328)
Bank-owned life insurance income                         (44) (44) (67)
Captive insurance net premiums                         (200) (209) (195)
Investment in tax credit entities                         (117) (114) (272)
Other                         (42) 24 (83)
Totals $ 485 $ 413 $ 405 $ 389 $ 440 $ 537 $ 568 $ 442 $ 216 $ 530 $ 287 $ 361 $ 1,692 $ 1,987 $ 1,394
Effective tax rate                         14.30% 16.10% 13.10%