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Note 20 - Unaudited Quarterly Results of Operations (Details) - USD ($)
$ / shares in Units, $ 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, 2017
Dec. 31, 2016
Dec. 31, 2015
Unaudited Quarterly Results Of Operations [Abstract]                      
Interest income $ 9,944 $ 9,830 $ 9,192 $ 9,136 $ 8,486 $ 8,287 $ 8,184 $ 8,280 $ 38,102 $ 33,237 $ 31,875
Interest expense 1,575 1,515 1,334 1,256 1,207 1,202 1,165 1,159 5,680 4,733 4,506
Net interest income 8,369 8,315 7,858 7,880 7,279 7,085 7,019 7,121 32,422 28,504 27,369
Provision for (credit to) loan losses 700 100 300 300 (95)     125 1,400 30 200
Non-interest income 1,812 1,470 1,615 1,990 1,073 1,644 1,374 1,576 6,887 5,667 6,032
Non-interest expense 5,999 6,191 5,942 5,588 5,435 5,616 5,593 5,519 23,720 22,163 22,398
Income before income taxes 3,482 3,494 3,231 3,982 3,012 3,113 2,800 3,053 14,189 11,978 10,803
Provision for income taxes 2,993 940 845 1,122 743 821 702 788 5,900 3,054 2,570
Net income $ 489 $ 2,554 $ 2,386 $ 2,860 $ 2,269 $ 2,292 $ 2,098 $ 2,265 $ 8,289 $ 8,924 $ 8,233
Earnings Per Share - basic $ 0.14 [1] $ 0.74 [1] $ 0.70 [1] $ 0.84 [1] $ 0.67 [1] $ 0.68 [1] $ 0.62 [1] $ 0.67 [1] $ 2.42 $ 2.64 $ 2.47
Earnings Per Share - diluted $ 0.14 [1] $ 0.74 [1] $ 0.69 [1] $ 0.83 [1] $ 0.66 [1] $ 0.67 [1] $ 0.62 [1] $ 0.67 [1] $ 2.41 $ 2.63 $ 2.46
[1] Due to rounding, quarterly earnings per share may not sum to annual earnings per share