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Note 4 - Loans and the Allowance for Credit Losses - Outstanding Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Loans	$ 1,495,545		$ 1,512,056
Deferred loan costs, net	3,952		3,737
Loans, amortized cost basis	1,499,497		1,515,793
Allowance for credit losses	(19,742)		(19,959)
Total net loans	1,479,755		1,495,834
Commercial Portfolio Segment [Member] \| Commercial Loans [Member]
Loans	159,905		167,851
Loans, amortized cost basis	160,834		168,696
Allowance for credit losses	(3,018)	$ (3,117)	(3,246)	$ (2,476)	$ (1,397)	$ (1,265)
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member]
Loans	139,336		157,526
Loans, amortized cost basis	139,609		157,768
Allowance for credit losses	(4,862)	(4,525)	(3,973)	(3,256)	(2,657)	(1,802)
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member]
Loans	1,015,901		1,002,627
Loans, amortized cost basis	1,017,842		1,003,944
Allowance for credit losses	(10,307)	(10,401)	(10,605)	(11,079)	(7,742)	(7,459)
Commercial Portfolio Segment [Member] \| Construction Loans [Member]
Loans	54,411		40,168
Loans, amortized cost basis	53,854		40,022
Allowance for credit losses	(292)	(360)	(514)	(726)	(694)	(815)
Residential Portfolio Segment [Member] \| Real Estate Loan [Member]
Loans	31,238		33,116
Loans, amortized cost basis	31,272		33,142
Allowance for credit losses	(213)	(216)	(258)	(265)	(110)	(102)
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member]
Loans	54,389		53,647
Loans, amortized cost basis	55,394		54,594
Allowance for credit losses	(469)	(475)	(502)	(600)	(562)	(460)
Consumer Portfolio Segment [Member]
Loans, amortized cost basis	40,692		57,627
Consumer Portfolio Segment [Member] \| Automobile Loan [Member]
Loans	25,425		39,595
Loans, amortized cost basis	25,652		40,020
Allowance for credit losses	(372)	(434)	(591)	(839)	(955)	(1,215)
Consumer Portfolio Segment [Member] \| Other Loans [Member]
Loans	14,940		17,526
Loans, amortized cost basis	15,040		17,607
Allowance for credit losses	$ (209)	$ (212)	$ (270)	$ (323)	$ (92)	$ (78)