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Note 4 - Loans and the Allowance for Credit Losses - Outstanding Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Loans	$ 1,496,494		$ 1,015,424
Deferred loan costs, net	3,485		3,147
Loans, amortized cost basis	1,499,979		1,018,571
Allowance for credit losses	(19,564)		(13,196)
Total net loans	1,480,415		1,005,375
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans	161,667		77,444
Loans, amortized cost basis	162,497		78,194
Allowance for credit losses	(2,476)	$ (1,397)	(1,265)	$ (1,359)	$ (1,426)	$ (1,134)
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans	154,107		118,866
Loans, amortized cost basis	154,366		119,110
Allowance for credit losses	(3,256)	(2,657)	(1,802)	(1,770)	(1,780)	(1,738)
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Loans	980,694		646,378
Loans, amortized cost basis	981,685		646,951
Allowance for credit losses	(11,079)	(7,742)	(7,459)	(7,508)	(7,581)	(6,678)
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans	49,199		53,503
Loans, amortized cost basis	49,055		53,285
Allowance for credit losses	(726)	(694)	(815)	(848)	(973)	(797)
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Loans	33,657		11,539
Loans, amortized cost basis	33,688		11,568
Allowance for credit losses	(265)	(110)	(102)	(110)	(121)	(137)
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member]
Loans	53,283		37,888
Loans, amortized cost basis	54,214		38,755
Allowance for credit losses	(600)	(562)	(460)	(456)	(458)	(439)
Consumer Portfolio Segment [Member]
Loans, amortized cost basis	64,474		70,708
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans	45,142		64,734
Loans, amortized cost basis	45,654		65,584
Allowance for credit losses	(839)	(955)	(1,215)	(1,468)	(1,654)	(1,865)
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans	18,745		5,072
Loans, amortized cost basis	18,820		5,124
Allowance for credit losses	$ (323)	$ (92)	$ (78)	$ (87)	$ (89)	$ (79)

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
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Amount of unamortized loan commitment, origination, and other costs (fees) and purchase premium (discount) on financing receivable recognized as adjustment to yield. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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