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Note 7 - Investment Securities - Securities by Contractual Maturity (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Securities available for sale, due in three months or less, amortized cost $ 150,268  
Securities available for sale, due in three months or less, fair value 150,515  
Securities available for sale, due after three months through one year, amortized cost 475,244  
Securities available for sale, due after three months through one year, fair value 477,929  
Securities available for sale, due after one year through five years, amortized cost 4,896,781  
Securities available for sale, due after one year through five years, fair value 4,956,310  
Securities available for sale, due after five years through ten years, amortized cost 4,113,562  
Securities available for sale, due after five years through ten years, fair value 4,186,789  
Securities available for sale, due after ten years, amortized cost 2,933,629  
Securities available for sale, due after ten years, fair value 2,979,444  
Residential mortgage-backed securities, amortized cost 11,776,371  
Residential mortgage-backed securities, fair value 11,719,012  
Securities available for sale, amortized cost 24,345,855 $ 25,577,244
Securities available for sale, fair value $ 24,469,999 $ 25,533,767