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Note 6 - Loans Receivable and Credit Disclosures - Amortized Cost Basis of Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Allowance for credit loss | $ 17,950 | $ 16,971 | $ 17,058 | $ 17,562 | $ 17,203 | $ 16,776
Construction Real Estate [Member] |  |  |  |  |  |
Allowance for credit loss | 492 | 481 | 482 | 564 | 413 | 408
Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Allowance for credit loss | 4,106 | 3,880 | 3,890 | 3,750 | 3,349 | 3,333
Multifamily [Member] |  |  |  |  |  |
Allowance for credit loss | 2,266 | 2,221 | 2,188 | 2,211 | 2,584 | 2,542
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Allowance for credit loss | 5,255 | 4,508 | 4,932 | 5,009 | 5,530 | 5,236
Agriculture Real Estate [Member] |  |  |  |  |  |
Allowance for credit loss | 1,563 | 1,573 | 1,584 | 1,559 | 1,226 | 1,238
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Allowance for credit loss | 2,085 | 1,888 | 1,759 | 2,323 | 1,912 | 1,955
Agriculture [Member] |  |  |  |  |  |
Allowance for credit loss | 1,809 | 1,991 | 1,805 | 1,715 | 1,710 | 1,607
Consumer and Other [Member] |  |  |  |  |  |
Allowance for credit loss | 374 | $ 429 | 418 | $ 431 | $ 479 | $ 457
Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 17,987 |  | 13,583 |  |  |
Real Estate [Member] | Construction Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 62 |  |  |
Real Estate [Member] | Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 1,267 |  | 696 |  |  |
Real Estate [Member] | Multifamily [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 900 |  | 947 |  |  |
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 13,555 |  | 10,785 |  |  |
Real Estate [Member] | Agriculture Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 538 |  | 420 |  |  |
Real Estate [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 413 |  | 460 |  |  |
Real Estate [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 1,314 |  | 213 |  |  |
Real Estate [Member] | Consumer and Other [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Equipment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 403 |  | 398 |  |  |
Equipment [Member] | Construction Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Equipment [Member] | Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Equipment [Member] | Multifamily [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Equipment [Member] | Agriculture Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Equipment [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 403 |  | 398 |  |  |
Equipment [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Equipment [Member] | Consumer and Other [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Other [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 938 |  | 765 |  |  |
Other [Member] | Construction Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Other [Member] | Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Other [Member] | Multifamily [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Other [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Other [Member] | Agriculture Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Other [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 642 |  | 405 |  |  |
Other [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 296 |  | 357 |  |  |
Other [Member] | Consumer and Other [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 3 |  |  |
Collateral Pledged [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 19,328 |  | 14,746 |  |  |
Allowance for credit loss | 1,385 |  | 90 |  |  |
Collateral Pledged [Member] | Construction Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 62 |  |  |
Allowance for credit loss | 0 |  | 0 |  |  |
Collateral Pledged [Member] | Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 1,267 |  | 696 |  |  |
Allowance for credit loss | 197 |  | 40 |  |  |
Collateral Pledged [Member] | Multifamily [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 900 |  | 947 |  |  |
Allowance for credit loss | 0 |  | 0 |  |  |
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 13,555 |  | 10,785 |  |  |
Allowance for credit loss | 870 |  | 0 |  |  |
Collateral Pledged [Member] | Agriculture Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 538 |  | 420 |  |  |
Allowance for credit loss | 0 |  | 0 |  |  |
Collateral Pledged [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 1,458 |  | 1,263 |  |  |
Allowance for credit loss | 318 |  | 50 |  |  |
Collateral Pledged [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 1,610 |  | 570 |  |  |
Allowance for credit loss | 0 |  | 0 |  |  |
Collateral Pledged [Member] | Consumer and Other [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 3 |  |  |
Allowance for credit loss | $ 0 |  | $ 0 |  |  |

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