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Note 23 - Quarterly Financial Data (Unaudited) - Summary of Quarterly Earnings (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Interest income $ 25,832 $ 25,789 $ 26,538 $ 27,151 $ 28,746 $ 27,995 $ 27,786 $ 29,509 $ 105,310 $ 114,036 $ 94,968
Interest expense 600 643 724 869 1,029 1,161 1,447 1,827 2,836 5,464 5,515
Net interest income 25,232 25,146 25,814 26,282 27,717 26,834 26,339 27,682 102,474 108,572 89,453
(Recovery of) provision for credit/loan losses (846) (1,394) (2,230) (4,001)         (8,471) 12,668 3,571
Net interest income after provision 26,078 26,540 28,044 30,283 27,083 22,131 22,508 24,182 110,945 95,904 85,882
Noninterest income, excluding net gain (loss) on sale of securities 9,215 8,720 8,797 7,569 7,733 7,638 6,913 7,164      
Noninterest expense 21,701 18,836 19,361 18,820 19,877 19,171 18,913 21,664 78,718 79,625 69,763
Income before income taxes 13,592 16,424 17,480 19,032 14,939 10,598 10,508 10,067 66,528 46,112 49,796
Income tax expense 3,037 3,816 4,077 4,430 3,389 2,332 2,270 2,195 15,360 10,186 10,994
Net income $ 10,555 $ 12,608 $ 13,403 $ 14,602 $ 11,550 $ 8,266 $ 8,238 $ 7,872 $ 51,168 $ 35,926 $ 38,802
Basic (in dollars per share) $ 0.62 $ 0.73 $ 0.77 $ 0.83 $ 0.65 $ 0.47 $ 0.47 $ 0.44 $ 2.95 $ 2.02 $ 2.47
Diluted (in dollars per share) 0.62 0.73 0.76 0.82 0.65 0.47 0.46 0.44 2.94 2.02 2.46
Dividends per common share (in dollars per share) $ 0.27 $ 0.27 $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 0.25 $ 1.04 $ 1.00 $ 0.96
Weighted average common shares outstanding, basic (in shares) 16,974,005 17,221,244 17,486,182 17,669,937 17,717,356 17,710,283 17,701,853 17,998,994 17,335,615 17,781,748 15,690,812
Weighted average diluted shares outstanding (in shares) 17,038,980 17,279,576 17,536,144 17,729,185 17,751,805 17,732,428 17,728,300 18,050,071 17,402,936 17,815,380 15,756,093
Provision for loan losses         $ 634 $ 4,703 $ 3,831 $ 3,500      
Net gain (loss) on sale of securities         $ 0 $ 0 $ 0 $ 385 $ 0 $ 385 $ (43)