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Note 3 - Investment Securities (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Security Owned and Pledged as Collateral, Fair Value, Total $ 20,890,319   $ 34,958,212
Proceeds from Sale of Debt Securities, Available-for-sale 513,845    
Debt Securities, Available-for-sale, Realized Gain (Loss), Total $ 8,569 $ 0