Note 5 - Loans and Leases - Classifications of Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Notes receivable, gross	$ 1,729,873		$ 1,687,137
Allowance for credit losses on loans	(18,975)	$ (18,886)	(18,806)	$ (18,350)	$ (17,910)	$ (17,149)
Unearned lease revenue	(2,055)		(2,039)
Loans and leases, net	1,708,843		1,666,292
Commercial Portfolio Segment [Member]
Allowance for credit losses on loans	(2,181)	(1,904)	(1,850)	(2,361)	(2,550)	(2,924)
Commercial Portfolio Segment [Member] | Commercial [Member]
Notes receivable, gross	154,158		152,640
Commercial Portfolio Segment [Member] | Municipal [Member]
Notes receivable, gross	107,219		94,724
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit losses on loans	(8,687)	(8,824)	(8,835)	(8,578)	(8,157)	(7,162)
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Notes receivable, gross	355,024		337,671
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Notes receivable, gross	274,762		278,293
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Notes receivable, gross	53,959		39,823
Consumer Portfolio Segment [Member]
Allowance for credit losses on loans	(2,368)	(2,263)	(2,391)	(2,514)	(2,448)	(2,827)
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Notes receivable, gross	54,558		56,640
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Notes receivable, gross	57,188		52,348
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Recourse [Member]
Notes receivable, gross	11,014		10,756
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonrecourse [Member]
Notes receivable, gross	92,756		112,595
Consumer Portfolio Segment [Member] | Direct Financing Lease [Member]
Notes receivable, gross	31,125		33,601
Consumer Portfolio Segment [Member] | Other Loan [Member]
Notes receivable, gross	23,499		16,500
Residential Portfolio Segment [Member]
Allowance for credit losses on loans	(5,726)	$ (5,846)	(5,694)	$ (4,847)	$ (4,683)	$ (4,169)
Residential Portfolio Segment [Member] | Construction Loans [Member]
Notes receivable, gross	32,645		36,536
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Notes receivable, gross	$ 481,966		$ 465,010