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Note 10 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
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, 2019
Dec. 31, 2018
Provision at statutory tax rates                 $ 2,814 $ 3,448
Tax effects of non-taxable income                 (344) (378)
Non-deductible interest expense                 19 15
Bank-owned life insurance                 (109) (117)
Other items, net                 (54) 103
Income tax expense $ 744 $ 513 $ 514 $ 555 $ 1,749 $ 388 $ 508 $ 426 $ 2,326 $ 3,071