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Note 4 - Per Share Data - Net Income Per Share (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Net income $ 5,458,000 $ 5,307,000 $ 3,649,000 $ 5,090,000 $ 5,681,000 $ 5,586,000 $ 6,371,000 $ 4,375,000 $ 19,504,000 $ 22,013,000
Less: Dividends and undistributed earnings allocated to participating securities                 (100,000) (110,000)
Net income attributable to common shares $ 5,431,000 $ 5,281,000 $ 3,630,000 $ 5,063,000 $ 5,654,000 $ 5,558,000 $ 6,339,000 $ 4,352,000 $ 19,404,000 $ 21,903,000
Basic weighted-average common shares outstanding (in shares)                 13,298,736 12,219,209
Basic earnings per common share (a) (in dollars per share) $ 0.40 $ 0.39 $ 0.27 $ 0.41 $ 0.46 $ 0.45 $ 0.52 $ 0.36 $ 1.46 [1] $ 1.79 [1]
Net income attributable to common shares                 $ 19,404,000 $ 21,903,000
Dilutive effect of potential common stock arising from stock options (in shares)                 22,823 38,159
Diluted weighted-average common shares outstanding (in shares)                 13,321,559 12,257,368
Diluted earnings per common share (a) (in dollars per share) $ 0.40 $ 0.39 $ 0.27 $ 0.41 $ 0.46 $ 0.45 $ 0.52 $ 0.36 $ 1.46 [1] $ 1.79 [1]
[1] Basic and diluted earnings per share under the two-class method are determined on net income reported on the income statement less earnings allocated to nonvested restricted shares with nonforfeitable dividends (participating securities).