Note 16 - Parent Company - Statements of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
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, 2016
Dec. 31, 2015
Dec. 31, 2014
Net gain (loss) on sales of securities                 $ 2,151 $ 398 $ (654)
Income tax expense (benefit) $ 1,532 $ 1,593 $ 1,888 $ 1,224 $ 1,748 $ 1,230 $ 871 $ 1,171 6,237 5,020 2,572
Net Income $ 3,578 $ 3,687 $ 4,239 $ 2,997 $ 4,014 $ 3,006 $ 2,285 $ 2,777 14,501 12,082 7,315
Parent Company [Member]                      
Dividends from subsidiary bank                 15,650
Net gain (loss) on sales of securities                 214
Total income                 15,650 214
Other expense                 332 321 282
Total expense                 332 321 282
Loss before tax and equity in undistributed net income of subsidiary bank                 15,318 (321) (68)
Income tax expense (benefit)                 (113) (109) 2
Income (Loss) before equity in undistributed net income of subsidiary bank                 15,431 (212) (70)
Equity in undistributed net income of subsidiary bank                 (930) 12,294 7,385
Net Income                 $ 14,501 $ 12,082 $ 7,315