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Note 1 - Summary of Significant Accounting Policies - Basic Earnings Per Share (EPS) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Net income | $ 18,850,063 | $ 17,194,169
Weighted average common shares outstanding (in shares) | 9,148,244 | 9,236,989
Basic EPS (in dollars per share) | $ 2.06 | $ 1.86

X
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