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Note 4 - Loans and the Allowance for Credit Losses - Outstanding Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Loans	$ 1,512,173		$ 1,512,056
Deferred loan costs, net	3,757		3,737
Loans, amortized cost basis	1,515,930		1,515,793
Allowance for credit losses	(19,740)		(19,959)
Total net loans	1,496,190		1,495,834
Commercial Portfolio Segment [Member] \| Commercial Loans [Member]
Loans	162,128		167,851
Loans, amortized cost basis	162,962		168,696
Allowance for credit losses	(3,117)	$ (3,154)	(3,246)	$ (1,397)	$ (1,286)	$ (1,265)
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member]
Loans	142,940		157,526
Loans, amortized cost basis	143,197		157,768
Allowance for credit losses	(4,525)	(4,068)	(3,973)	(2,657)	(1,765)	(1,802)
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member]
Loans	1,026,049		1,002,627
Loans, amortized cost basis	1,027,892		1,003,944
Allowance for credit losses	(10,401)	(10,298)	(10,605)	(7,742)	(7,635)	(7,459)
Commercial Portfolio Segment [Member] \| Construction Loans [Member]
Loans	48,672		40,168
Loans, amortized cost basis	48,112		40,022
Allowance for credit losses	(360)	(358)	(514)	(694)	(792)	(815)
Residential Portfolio Segment [Member] \| Real Estate Loan [Member]
Loans	32,223		33,116
Loans, amortized cost basis	32,249		33,142
Allowance for credit losses	(216)	(237)	(258)	(110)	(111)	(102)
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member]
Loans	54,993		53,647
Loans, amortized cost basis	55,975		54,594
Allowance for credit losses	(475)	(489)	(502)	(562)	(553)	(460)
Consumer Portfolio Segment [Member]
Loans, amortized cost basis	45,543		57,627
Consumer Portfolio Segment [Member] \| Automobile Loan [Member]
Loans	29,616		39,595
Loans, amortized cost basis	29,898		40,020
Allowance for credit losses	(434)	(491)	(591)	(955)	(1,083)	(1,215)
Consumer Portfolio Segment [Member] \| Other Loans [Member]
Loans	15,552		17,526
Loans, amortized cost basis	15,645		17,607
Allowance for credit losses	$ (212)	$ (226)	$ (270)	$ (92)	$ (94)	$ (78)