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Note 10 - Federal Home Loan Bank Advances (Details Textual)
12 Months Ended
Jun. 22, 2020
Apr. 23, 2020
Oct. 31, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
Proceeds from FHLBank Borrowings, Financing Activities       $ 0 $ 1,000,000  
Collateralized Mortgage Backed Securities [Member]            
Pledged Assets Separately Reported, Securities Pledged for Federal Home Loan Bank, at Fair Value       $ 2,554,993    
Federal Home Loan Bank of Topeka [Member]            
FHLB Stock to be Purchased upon FHLB Borrowing, Percent       4.50%    
Proceeds from FHLBank Borrowings, Financing Activities     $ 1,000,000      
Payments to Acquire Federal Home Loan Bank Stock     $ 45,000      
Debt Instrument, Term (Year) 2 years 2 years        
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 0.28% 0.37%   1.66%    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Number of Advances 2 2        
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances       $ 2,000,000 $ 2,000,000  
Federal Home Loan Bank of Topeka [Member] | Federal Home Loan Bank Advances [Member]            
Debt Instrument, Term (Year)           10 years