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Note 23 - Parent Company Condensed Financial Information - Condensed Statements of Income (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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other income                         $ 103 $ 97 $ 78
Income (loss) on equity securities                         32 (207)
Other operating expenses                         (3,418) (3,528) (3,448)
Income tax benefit $ (440) $ (537) $ (568) $ (442) $ (216) $ (530) $ (287) $ (361) $ (928) $ (825) $ (835) $ (515) (1,987) (1,394) (3,103)
Net income $ 2,403 $ 2,915 $ 2,860 $ 2,147 $ 2,496 $ 2,524 $ 2,100 $ 2,133 $ 1,587 $ 2,109 $ 2,190 $ 1,553 10,325 9,253 7,439
Parent Company [Member]                              
Dividend income from subsidiaries                         4,450 6,297 4,175
Other income                         59 16 4
Income (loss) on equity securities                         32 (207)
Other operating expenses                         (714) (587) (383)
Income before income taxes and equity in undistributed net income of subsidiaries                         3,827 5,519 3,796
Income tax benefit                         199 210 147
Income before equity in undistributed net income of subsidiaries                         (4,026) (5,729) (3,943)
Equity in undistributed net income of subsidiaries                         (6,299) (3,524) (3,496)
Net income                         $ 10,325 $ 9,253 $ 7,439