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Note 3 - Securities (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Security Owned and Pledged as Collateral, Fair Value, Total $ 5,358,929 $ 24,374,187  
Debt Securities, Available-for-sale, Realized Gain 244,777 48,931 $ 165,237
Debt Securities, Available-for-sale, Realized Loss 155,213 57,022 118,908
Available-for-sale Debt Securities, Gross Realized Gain (Loss), Tax Effect 18,809 (2,063) $ 17,142
Debt Securities, Available-for-sale, Unrealized Loss Position, Total $ 42,570,363 $ 70,434,596  
Percentage of Available-for-sale Debt Securities in Continuous Unrealized Loss Position to Total Investment Portfolio 36.00% 82.00%