Note 5 - Loans and Leases - Classifications of Loans and Leases (Details) - USD ($) $ in Thousands		Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Notes receivable, gross		$ 1,628,820	$ 1,565,920
Allowance for credit losses on loans		(17,910)	(17,149)	$ (16,081)	$ (15,624)
Unearned lease revenue		(1,821)	(1,746)
Loans and leases, net		1,609,089	1,547,025
Commercial Portfolio Segment [Member]
Allowance for credit losses on loans		(2,550)	(2,924)	(2,780)	(2,204)
Loans and leases, net			234,478
Commercial Portfolio Segment [Member] | Commercial [Member]
Notes receivable, gross		136,966	166,491
Commercial Portfolio Segment [Member] | Municipal [Member]
Notes receivable, gross		110,092	67,987
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit losses on loans		(8,157)	(7,162)	(6,822)	(7,422)
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Notes receivable, gross		310,289	316,867
Loans and leases, net			316,867
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Notes receivable, gross		282,200	270,810
Loans and leases, net			270,810
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Notes receivable, gross		33,192	18,941
Loans and leases, net			18,941
Consumer Portfolio Segment [Member]
Allowance for credit losses on loans		(2,448)	(2,827)	(2,547)	(2,404)
Loans and leases, net			282,710
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Notes receivable, gross		59,461	59,118
Loans and leases, net			59,118
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Notes receivable, gross		49,928	52,568
Loans and leases, net			52,568
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans and leases, net			131,936
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Recourse [Member]
Notes receivable, gross		12,207	12,929
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonrecourse [Member]
Notes receivable, gross		125,051	114,909
Consumer Portfolio Segment [Member] | Direct Financing Lease [Member]
Notes receivable, gross		33,905	33,223
Loans and leases, net	[1]		31,477
Consumer Portfolio Segment [Member] | Other Loan [Member]
Notes receivable, gross		13,181	11,709
Loans and leases, net			7,611
Residential Portfolio Segment [Member]
Allowance for credit losses on loans		(4,683)	(4,169)	$ (3,851)	$ (3,508)
Loans and leases, net			440,368
Residential Portfolio Segment [Member] | Construction Loans [Member]
Notes receivable, gross		45,322	42,232
Loans and leases, net			42,232
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Notes receivable, gross		$ 417,026	398,136
Loans and leases, net			$ 398,136

[1] Net of unearned lease revenue of $1.7 million.