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Note 23 - Quarterly Data (Unaudited) - Summary of Quarterly Data (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
Interest income $ 8,087 $ 7,820 $ 7,683 $ 7,510 $ 7,721 $ 7,760 $ 7,478 $ 7,196 $ 31,100 $ 30,155
Interest expense 804 685 626 591 588 587 561 535 2,706 2,271
Net interest income 7,283 7,135 7,057 6,919 7,133 7,173 6,917 6,661 28,394 27,884
Provision for loan losses 523 373 576 515 1,814 680 536 167 1,987 3,197
Net interest income after provision (reduction in reserve) for loan losses 6,760 6,762 6,481 6,404 5,319 6,493 6,381 6,494 26,407 24,687
Income 1,333 1,236 930 1,167 1,165 1,567 1,480 989 4,666 5,201
Expense 7,359 7,190 6,863 7,037 6,826 7,348 7,255 7,066 28,449 28,495
Income (loss) before income taxes 734 808 548 534 (342) 712 606 417    
Provision for (benefit from) income taxes 2,600 173 132 130 (237) 162 144 100 3,035 169
Net income (loss) $ (1,866) $ 635 $ 416 $ 404 $ (105) $ 550 $ 462 $ 317 $ (411) $ 1,224
Basic earnings (loss) (in dollars per share) $ (0.30) $ 0.10 $ 0.07 $ 0.07 $ (0.02) $ 0.09 $ 0.08 $ 0.05 $ (0.07) $ 0.20
Diluted earnings (loss) (in dollars per share) $ (0.29) $ 0.10 $ 0.06 $ 0.06 $ (0.02) $ 0.09 $ 0.07 $ 0.05 $ (0.06) $ 0.19