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Note 3 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Securities available for sale, due in three months or less, amortized cost $ 372,480  
Securities available for sale, due in three months or less, fair value 373,288  
Securities available for sale, due after three months through one year, amortized cost 1,383,663  
Securities available for sale, due after three months through one year, fair value 1,397,096  
Securities available for sale, due after one year through five years, amortized cost 4,340,262  
Securities available for sale, due after one year through five years, fair value 4,446,310  
Securities available for sale, due after five years through ten years, amortized cost 3,847,841  
Securities available for sale, due after five years through ten years, fair value 3,967,774  
Securities available for sale, due after ten years, amortized cost 3,181,828  
Securities available for sale, due after ten years, fair value 3,280,849  
Residential mortgage-backed securities, amortized cost 10,935,731  
Residential mortgage-backed securities, fair value 11,050,442  
Securities available for sale, amortized cost 24,061,805 $ 25,577,244
Securities available for sale, fair value $ 24,515,759 $ 25,533,767