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Note 25 - Quarterly Data (Unaudited) - Summary of Quarterly Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Interest income $ 11,177 $ 9,452 $ 8,390 $ 8,119 $ 8,087 $ 7,820 $ 7,683 $ 7,510 $ 37,138 $ 31,100
Interest expense 1,533 1,124 888 805 804 685 626 591 4,350 2,706
Net interest income 9,644 8,328 7,502 7,314 7,283 7,135 7,057 6,919 32,788 28,394
Provision (reduction in reserve) for loan losses 473 789 702 658 523 373 576 515 2,622 1,987
Net interest income after provision (reduction in reserve) for loan losses 9,171 7,539 6,800 6,656 6,760 6,762 6,481 6,404 30,166 26,407
Non-interest income:                    
Total non-interest income 1,158 2,112 1,132 1,140 1,333 1,236 930 1,167 5,542 4,666
Expense 8,382 9,142 7,492 7,301 7,359 7,190 6,863 7,037 32,317 28,449
Income (loss) before income taxes 1,947 509 440 495 734 808 548 534    
Provision for (benefit from) income taxes 470 269 81 81 2,600 173 132 130 901 3,035
Net income (loss) $ 1,477 $ 240 $ 359 $ 414 $ (1,866) $ 635 $ 416 $ 404 $ 2,490 $ (411)
Earnings per common share:                    
Basic earnings (loss) (in dollars per share) $ 0.23 $ 0.04 $ 0.06 $ 0.07 $ (0.30) $ 0.10 $ 0.07 $ 0.07 $ 0.40 $ (0.07)
Earnings Per Share, Diluted, Total $ 0.22 $ 0.03 $ 0.06 $ 0.06 $ (0.30) $ 0.10 $ 0.06 $ 0.06 $ 0.37 $ (0.07)