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Note 3 - Investment Securities (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale $ 19,994,811 $ 31,327,354
Debt Securities, Available-for-Sale, Realized Gain (Loss), Total 0 9,190
Securities Called at a Premium [Member]    
Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale 0 1,263,845
Asset Pledged as Collateral [Member] | Government Deposits and Securities Sold Under Repurchase Agreement [Member]    
Debt Securities, Total $ 24,258,980 $ 14,307,989