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Note 23 - Return on Equity and Assets - Summary of Return on Equity and Assets (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
Average total assets                 $ 1,069,656 $ 757,052 $ 710,271
Average shareholders' equity                 110,966 68,741 64,655
Net income $ 2,386 $ 2,462 $ 2,507 $ 2,100 $ 1,660 $ 1,343 $ 1,926 $ 1,487 9,455 6,416 6,865
Net income available to common shareholders                 $ 9,455 $ 6,416 $ 6,865
Cash dividends declared per share (in dollars per share)                 $ 1.08 $ 1.08 $ 1.07
Return on average total assets                 0.88% 0.85% 0.97%
Return on average shareholders' equity                 8.52% 9.33% 10.62%
Dividend payout ratio (1) [1]                 35.52% 36.18% 31.36%
Average shareholders' equity to average assets                 10.37% 9.08% 9.10%
[1] Cash dividends declared on common shares divided by net income available to common shareholders.