Note 18 - Condensed Financial Information - Parent Company Only - Condensed 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
Income:                      
Income from trust                 $ 7 $ 6 $ 6
Expense:                      
Interest on subordinated debentures                 625 1,450 2,281
Interest on junior subordinated debentures                 247 206 236
Other operating expenses                 3,075 3,031 2,853
Other losses                 (277) (281) (2,279)
Total expenses $ 7,163 $ 6,553 $ 7,025 $ 6,804 $ 8,587 $ 6,415 $ 6,680 $ 6,782 27,545 28,464 33,569
Income (loss) before income taxes 1,660 2,741 2,286 1,369 1,490 2,337 841 3,413 8,056 8,081 13,746
Income tax expense (benefit) 136 724 661 226 (27,719) 22 (62) 1,747 (27,759) 326
Net income $ 1,524 $ 2,017 $ 1,625 $ 1,143 $ 29,209 $ 2,337 $ 819 $ 3,475 6,309 35,840 13,420
Parent Company [Member]                      
Income:                      
Dividends from subsidiaries                 16,000 12,500 1,000
Income from trust                 7 6 6
Other income                 275
Total income                 16,007 12,506 1,281
Expense:                      
Interest on subordinated debentures                 625 1,450 2,281
Interest on junior subordinated debentures                 247 206 236
Other operating expenses                 182 168 128
Other losses                 115 114 276
Total expenses                 1,169 1,938 2,921
Income (loss) before income taxes                 14,838 10,568 (1,640)
Income tax expense (benefit)                
Income (loss) before equity in undistributed net income of subsidiary                 14,838 10,568 (1,640)
Equity in undistributed net income of subsidiary                 (8,529) 25,272 15,060
Net income                 $ 6,309 $ 35,840 $ 13,420