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Note 4 - Mortgage Banking (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Mortgage Loans Serviced for Others $ 488,600,000 $ 481,900,000
Servicing Asset at Fair Value, Amount, Ending Balance 5,855,000 5,521,000
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance, Ending Balance $ 0 $ 0
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 8.00% 8.00%
Minimum [Member]    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 5.20% 5.00%
Maximum [Member]    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 6.70% 27.00%