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Note 3 - Investment Securities (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss $ 382,131 $ 382,131   $ 418,549
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss 101,097 101,097   121,670
Proceeds from Sale of Debt Securities, Available-for-Sale 521,162 521,162 $ 0  
Debt Securities, Available-for-Sale, Realized Gain (Loss) (31,922) (31,922)    
Asset Pledged as Collateral [Member] | Government Deposits and Securities Sold Under Repurchase Agreement [Member]        
Debt Securities $ 72,562,872 $ 72,562,872   $ 50,371,861