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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)

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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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