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Note 22 - Selected Quarterly Financial Data (Unaudited) - Selected Quarterly Financial Data (Unaudited) (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
Total interest and dividend income $ 13,459 $ 12,829 $ 12,129 $ 11,940 $ 11,564 $ 11,330 $ 10,902 $ 10,199 $ 50,357 $ 43,995
Total interest expense 2,998 2,584 2,287 2,040 1,762 1,818 1,625 1,442 9,909 6,647
Net interest income 10,461 10,245 9,842 9,900 9,802 9,512 9,277 8,757 40,448 37,348
Provision for Loan and Lease Losses, Total 210 210 210 210 430 280 170 165    
Net interest income after provision for loan losses 10,251 10,035 9,632 9,690 9,372 9,232 9,107 8,592 39,608 36,303
Total noninterest income 977 954 1,009 788 918 1,441 989 1,511 3,728 4,859
Total noninterest expense 7,243 7,092 7,063 7,345 6,217 7,297 6,704 7,267 28,743 27,485
Income before income taxes 3,985 3,897 3,578 3,133 4,073 3,376 3,392 2,836 14,593 13,677
Income taxes 560 593 481 528 1,687 914 885 736 2,162 4,222
Net income $ 3,425 $ 3,304 $ 3,097 $ 2,605 $ 2,386 $ 2,462 $ 2,507 $ 2,100 $ 12,431 $ 9,455
Net income, basic (in dollars per share) $ 1.06 $ 1.02 $ 0.96 $ 0.81 $ 0.73 $ 0.77 $ 0.84 $ 0.78 $ 3.85 $ 3.12
Net income, diluted (in dollars per share) $ 1.05 $ 1.02 $ 0.96 $ 0.80 $ 0.73 $ 0.76 $ 0.83 $ 0.78 $ 3.83 $ 3.10
Weighted-average common shares and common stock equivalents used to calculate basic earnings per share (in shares) 3,239,180 3,234,393 3,225,726 3,220,262 3,215,300 3,212,335 3,000,451 2,679,816 3,229,954 3,028,950
Weighted-average common shares and common stock equivalents used to calculate diluted earnings per share (in shares) 3,250,149 3,248,326 3,240,329 3,238,069 3,231,791 3,223,753 3,014,140 2,692,015 3,243,907 3,052,585