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Note 3 - Available-for-sale Securities (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Proceeds from Sale of Debt Securities, Available-for-sale $ 0 $ 0    
Available-for-sale Securities, Greater than 10% of Stockholders' Equity 0   $ 0  
Debt Securities, Available-for-sale, Total 61,374,800   44,517,178  
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Total 0      
Loans and Securities Pledged to Secure FHLB Advances 149,600,000      
Loans and Securities Pledged to Secure Public Deposits 4,000,000      
Collateralized Mortgage Backed Securities [Member]        
Debt Securities, Available-for-sale, Total 13,200,000   $ 13,400,000  
Commercial Mortgage Backed Securities [Member]        
Debt Securities, Available-for-sale, Total $ 0     $ 0