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Note 9 - Earnings Per Share - Reconciliation of Basic and Diluted Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Net income as reported | $ 3,192 | $ 2,222
Weighted average common shares outstanding (in shares) | 3,458,505 | 3,343,183
Basic earnings per common share (in dollars per share) | $ 0.92 | $ 0.66
Add: Dilutive effect of assumed stock option exercises (in shares) |  |
Weighted average common and dilutive potential common shares outstanding (in shares) | 3,458,505 | 3,343,183
Diluted earnings per common share (in dollars per share) | $ 0.92 | $ 0.66

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