Note 5 - Mortgage Loan Servicing (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Continuing Involvement with Transferred Financial Assets Custodial Escrow Balance	$ 10,100	$ 11,600
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance	0	0
Servicing Asset at Fair Value, Amount	$ 19,300	$ 17,700
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate	11.00%	11.25%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed	7.44%	6.60%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Expected Credit Losses	0.29%	0.28%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Weighted Average Life (Year)	8 years 7 months 6 days	8 years 10 months 24 days
Maximum [Member]
Late and Ancillary Fee Income Generated by Servicing Financial Assets, Amount	$ 100	$ 100