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Note 5 - Mortgage Loan Servicing (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Continuing Involvement with Transferred Financial Assets Custodial Escrow Balance $ 11,600 $ 12,100
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance, Ending Balance 0 0
Servicing Asset at Fair Value, Amount, Ending Balance $ 17,700 $ 15,400
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 11.25% 8.00%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 6.60% 7.40%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected Credit Losses 0.28% 0.25%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life (Year) 8 years 10 months 24 days 8 years 6 months
Maximum [Member]    
Late and Ancillary Fee Income Generated by Servicing Financial Assets, Amount $ 100 $ 100