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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
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-Paragraph 5
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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Note 4 - Loans and the Allowance for Credit Losses - Outstanding Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Loans	$ 1,017,846		$ 1,015,424
Deferred loan costs, net	3,236		3,147
Loans, amortized cost basis	1,021,082		1,018,571
Allowance for credit losses	(14,209)		(13,196)
Total net loans	1,006,873		1,005,375
Commercial Portfolio Segment [Member] \| Commercial Loans [Member]
Loans	81,118		77,444
Loans, amortized cost basis	81,899		78,194
Allowance for credit losses	(1,397)	$ (1,286)	(1,265)	$ (1,426)	$ (1,311)	$ (1,134)
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member]
Loans	113,850		118,866
Loans, amortized cost basis	114,108		119,110
Allowance for credit losses	(2,657)	(1,765)	(1,802)	(1,780)	(1,652)	(1,738)
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member]
Loans	673,129		646,378
Loans, amortized cost basis	673,808		646,951
Allowance for credit losses	(7,742)	(7,635)	(7,459)	(7,581)	(6,917)	(6,678)
Commercial Portfolio Segment [Member] \| Construction Loans [Member]
Loans	40,798		53,503
Loans, amortized cost basis	40,699		53,285
Allowance for credit losses	(694)	(792)	(815)	(973)	(918)	(797)
Residential Portfolio Segment [Member] \| Real Estate Loan [Member]
Loans	11,053		11,539
Loans, amortized cost basis	11,080		11,568
Allowance for credit losses	(110)	(111)	(102)	(121)	(134)	(137)
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member]
Loans	41,620		37,888
Loans, amortized cost basis	42,526		38,755
Allowance for credit losses	(562)	(553)	(460)	(458)	(437)	(439)
Consumer Portfolio Segment [Member]
Loans, amortized cost basis	56,962		70,708
Consumer Portfolio Segment [Member] \| Automobile Loan [Member]
Loans	51,487		64,734
Loans, amortized cost basis	52,102		65,584
Allowance for credit losses	(955)	(1,083)	(1,215)	(1,654)	(1,700)	(1,865)
Consumer Portfolio Segment [Member] \| Other Loans [Member]
Loans	4,791		5,072
Loans, amortized cost basis	4,860		5,124
Allowance for credit losses	$ (92)	$ (94)	$ (78)	$ (89)	$ (88)	$ (79)