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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)

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- 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 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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