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Note 22 - Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dividends                         $ 78 $ 67 $ 107
Other operating expenses                         (3,448) (3,589) (2,558)
Income tax benefit $ (928) $ (825) $ (835) $ (515) $ (626) $ (666) $ (667) $ (564) $ (501) $ (507) $ (487) $ (469) (3,103) (2,523) (1,964)
Net income $ 1,587 $ 2,109 $ 2,190 $ 1,553 $ 1,741 $ 1,758 $ 1,783 $ 1,582 $ 1,106 $ 1,398 $ 1,228 $ 1,466 7,439 6,864 5,198
Parent Company [Member]                              
Dividend income from subsidiaries                         4,175 2,550 18,200
Dividends                         4 152 9
Other operating expenses                         (383) (534) (1,116)
Income before income taxes and equity in undistributed net income of subsidiaries                         3,796 2,168 17,093
Income tax benefit                         147 158 179
Income before equity in undistributed net income of subsidiaries                         3,943 2,326 17,272
Equity in undistributed net income of subsidiaries                         3,496 4,538 (12,074)
Net income                         $ 7,439 $ 6,864 $ 5,198