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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, 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
Other income                         $ 63 $ 103 $ 97
Unrealized gain (loss) on equity securities                         (194) 32 (207)
Other operating expenses                         (3,318) (3,418) (3,528)
Income before income taxes and equity in undistributed net income of shareholders                         1,771 3,827 5,519
Income tax benefit $ (485) $ (413) $ (405) $ (389) $ (440) $ (537) $ (568) $ (442) $ (216) $ (530) $ (287) $ (361) (1,692) (1,987) (1,394)
Net Income $ 2,853 $ 2,746 $ 2,438 $ 2,094 $ 2,403 $ 2,915 $ 2,860 $ 2,147 $ 2,496 $ 2,524 $ 2,100 $ 2,133 10,131 10,325 9,253
Parent Company [Member]                              
Dividend income from subsidiaries                         2,730 4,450 6,297
Other income                         59 59 16
Unrealized gain (loss) on equity securities                         (194) 32 (207)
Other operating expenses                         (824) (714) (587)
Income tax benefit                         315 199 210
Income before equity in undistributed net income of subsidiaries                         (2,086) (4,026) (5,729)
Equity in undistributed net income of subsidiaries                         (8,045) (6,299) (3,524)
Net Income                         $ 10,131 $ 10,325 $ 9,253