Note 5 - Loans and Leases - Classifications of Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Notes receivable, gross	$ 2,024,315	$ 1,912,605
Allowance for credit losses on loans	(20,942)	(20,168)	$ (20,017)	$ (19,666)
Unearned lease revenue	(1,262)	(1,454)
Loans and leases, net	2,002,111	1,890,983
Commercial Portfolio Segment [Member]
Allowance for credit losses on loans	(2,956)	(2,731)	(2,413)	(2,345)
Commercial Portfolio Segment [Member] | Commercial [Member]
Notes receivable, gross	239,736	220,526
Commercial Portfolio Segment [Member] | Municipal [Member]
Notes receivable, gross	130,303	120,604
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit losses on loans	(9,431)	(8,806)	(9,182)	(8,943)
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Notes receivable, gross	499,441	416,521
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Notes receivable, gross	359,640	340,808
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Notes receivable, gross	48,306	56,684
Consumer Portfolio Segment [Member]
Allowance for credit losses on loans	(2,051)	(2,173)	(2,271)	(2,377)
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]
Notes receivable, gross	52,696	53,973
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Notes receivable, gross	71,189	70,195
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Recourse [Member]
Notes receivable, gross	9,256	10,139
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonrecourse [Member]
Notes receivable, gross	37,326	43,852
Consumer Portfolio Segment [Member] | Direct Financing Lease [Member]
Notes receivable, gross	17,446	19,666
Consumer Portfolio Segment [Member] | Other Loan [Member]
Notes receivable, gross	26,328	28,463
Residential Portfolio Segment [Member]
Allowance for credit losses on loans	(6,474)	(6,404)	$ (6,094)	$ (5,989)
Residential Portfolio Segment [Member] | Construction Loans [Member]
Notes receivable, gross	16,581	15,685
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Notes receivable, gross	$ 516,067	$ 515,489