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Note 5 - Related Party Transactions (Details Textual) - USD ($)
12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Loans and Leases Receivable, Related Parties, Ending Balance   $ 13,822,556 $ 14,558,882 $ 14,551,236
Related Party Deposit Liabilities   27,187,933 20,611,092  
Payments to Fund Long-term Loans to Related Parties   40,754 54,544  
The Company Related to Director [Member]        
Loans and Leases Receivable, Related Parties, Ending Balance $ 1,096,000      
The Company Related to Director [Member] | Sale Of Real Property To Related Party [Member]        
Related Party Transaction, Amounts of Transaction $ 1,359,613      
Unused lines of Credit [Member]        
Loans and Leases Receivable, Related Parties, Ending Balance   $ 143,000 $ 330,515