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Note 6 - Loans Receivable and Credit Disclosures - Composition of Loans Receivable (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Loans receivable |  | $ 1,296,421 |  | $ 1,320,813 |  |  |
Unallocated portfolio layer basis adjustments1 | [1] | 194 |  | 162 |  |  |
Less allowance for credit losses |  | (16,971) | $ (18,004) | (17,058) | $ (17,203) | $ (16,952) | $ (16,776)
Loans receivable, net |  | 1,279,644 |  | 1,303,917 |  |  |
Construction Real Estate [Member] |  |  |  |  |  |  |
Loans receivable |  | 57,304 |  | 59,281 |  |  |
Less allowance for credit losses |  | (481) | (503) | (482) | (413) | (453) | (408)
Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |  |
Loans receivable |  | 312,570 |  | 309,704 |  |  |
Less allowance for credit losses |  | (3,880) | (3,850) | (3,890) | (3,349) | (3,309) | (3,333)
Multifamily [Member] |  |  |  |  |  |  |
Loans receivable |  | 204,409 |  | 200,209 |  |  |
Less allowance for credit losses |  | (2,221) | (2,152) | (2,188) | (2,584) | (2,537) | (2,542)
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |
Loans receivable |  | 321,009 |  | 350,493 |  |  |
Less allowance for credit losses |  | (4,508) | (4,940) | (4,932) | (5,530) | (5,494) | (5,236)
Agriculture Real Estate [Member] |  |  |  |  |  |  |
Loans receivable |  | 159,845 |  | 159,880 |  |  |
Less allowance for credit losses |  | (1,573) | (1,589) | (1,584) | (1,226) | (1,221) | (1,238)
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |
Loans receivable |  | 97,129 |  | 90,023 |  |  |
Less allowance for credit losses |  | (1,888) | (2,886) | (1,759) | (1,912) | (1,913) | (1,955)
Agriculture [Member] |  |  |  |  |  |  |
Loans receivable |  | 126,425 |  | 134,157 |  |  |
Less allowance for credit losses |  | (1,991) | (1,674) | (1,805) | (1,710) | (1,588) | (1,607)
Consumer and Other [Member] |  |  |  |  |  |  |
Loans receivable |  | 17,730 |  | 17,066 |  |  |
Less allowance for credit losses |  | $ (429) | $ (410) | $ (418) | $ (479) | $ (437) | $ (457)
[1] | This amount represents portfolio layer method basis adjustments related to loans hedged in a closed portfolio. Under the portfolio layer method basis adjustments are not allocated to individual loans, however, the amounts impact the net loan balance. These basis adjustments would be allocated to the amortized cost of specific loans within the pool if the hedge was de-designated. See Note 11 (“Derivative Financial Instruments”) for additional information.

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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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- Definition 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 -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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