Note 5 - Mortgage Servicing Rights (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Loans Serviced During the Period			$ 2,030,603,000		$ 2,022,066,000
Fees and Commissions, Mortgage Banking and Servicing	$ 1,269,000	$ 1,199,000	2,535,000	$ 2,355,000
Escrow Deposit	12,742,000		12,742,000		11,912,000
Mortgage Servicing Rights Measured at Fair Value	$ 20,199,000		$ 20,199,000		$ 19,288,000