Note 19 - Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ 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
Interest income $ 8,776 $ 8,765 $ 8,663 $ 8,544 $ 8,606 $ 8,199 $ 7,699 $ 7,697 $ 34,748 $ 32,201 $ 32,673
Interest expense 1,056 1,085 1,050 1,006 991 1,017 1,378 1,415 4,197 4,801 6,147
Net interest income 7,720 7,680 7,613 7,538 7,615 7,182 6,321 6,282 30,551 27,400 26,526
Provision (credit) for loan and lease losses 295 (234) 396 696 (1,005) (191) 345 (494) 1,153 (1,345) (5,869)
Net interest income after provision (credit) for loan and lease losses 7,425 7,914 7,217 6,842 8,620 7,373 5,976 6,776 29,398 28,745 32,395
Non-interest income 1,398 1,380 2,094 1,331 1,457 1,379 1,545 3,419 6,203 7,800 14,920
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
Basic (in dollars per share) $ 0.09 $ 0.12 $ 0.10 $ 0.07 $ 1.77 $ 0.14 $ 0.05 $ 0.21 $ 0.38 $ 2.17 $ 0.81
Diluted (in dollars per share) $ 0.09 $ 0.12 $ 0.10 $ 0.07 $ 1.77 $ 0.14 $ 0.05 $ 0.21 $ 0.38 $ 2.17 $ 0.81
Non-interest expense $ 7,163 $ 6,553 $ 7,025 $ 6,804 $ 8,587 $ 6,415 $ 6,680 $ 6,782 $ 27,545 $ 28,464 $ 33,569