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Note 7 - Loans Receivable and Credit Disclosures - Amortized Cost Basis of Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Allowance for credit loss | $ 17,562 | $ 17,203 | $ 16,776 | $ 16,118 | $ 16,319 | $ 15,697
Construction Real Estate [Member] |  |  |  |  |  |
Allowance for credit loss | 564 | 413 | 408 | 416 | 412 | 730
Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Allowance for credit loss | 3,750 | 3,349 | 3,333 | 3,258 | 3,357 | 3,028
Multifamily [Member] |  |  |  |  |  |
Allowance for credit loss | 2,211 | 2,584 | 2,542 | 2,495 | 2,524 | 2,493
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Allowance for credit loss | 5,009 | 5,530 | 5,236 | 4,998 | 5,033 | 4,742
Agriculture Real Estate [Member] |  |  |  |  |  |
Allowance for credit loss | 1,559 | 1,226 | 1,238 | 1,229 | 1,214 | 1,625
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Allowance for credit loss | 2,323 | 1,912 | 1,955 | 1,874 | 2,014 | 1,153
Agriculture [Member] |  |  |  |  |  |
Allowance for credit loss | 1,715 | 1,710 | 1,607 | 1,398 | 1,358 | 1,705
Consumer and Other [Member] |  |  |  |  |  |
Allowance for credit loss | 431 | $ 479 | 457 | $ 450 | $ 407 | $ 221
Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 15,355 |  | 12,577 |  |  |
Real Estate [Member] | Construction Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 62 |  | 66 |  |  |
Real Estate [Member] | Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 500 |  | 678 |  |  |
Real Estate [Member] | Multifamily [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 2,020 |  | 2,034 |  |  |
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 11,360 |  | 8,993 |  |  |
Real Estate [Member] | Agriculture Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 1,087 |  | 449 |  |  |
Real Estate [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 108 |  | 118 |  |  |
Real Estate [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 218 |  | 239 |  |  |
Real Estate [Member] | Consumer and Other [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Equipment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 772 |  | 669 |  |  |
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 | 763 |  | 0 |  |  |
Equipment [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 9 |  | 669 |  |  |
Equipment [Member] | Consumer and Other [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 0 |  | 0 |  |  |
Other [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 1,335 |  | 503 |  |  |
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 | 934 |  | 101 |  |  |
Other [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 396 |  | 402 |  |  |
Other [Member] | Consumer and Other [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 5 |  | 0 |  |  |
Collateral Pledged [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 17,462 |  | 13,749 |  |  |
Allowance for credit loss | 635 |  | 106 |  |  |
Collateral Pledged [Member] | Construction Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 62 |  | 66 |  |  |
Allowance for credit loss | 0 |  | 0 |  |  |
Collateral Pledged [Member] | Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 500 |  | 678 |  |  |
Allowance for credit loss | 40 |  | 10 |  |  |
Collateral Pledged [Member] | Multifamily [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 2,020 |  | 2,034 |  |  |
Allowance for credit loss | 0 |  | 0 |  |  |
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 11,360 |  | 8,993 |  |  |
Allowance for credit loss | 0 |  | 0 |  |  |
Collateral Pledged [Member] | Agriculture Real Estate [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 1,087 |  | 449 |  |  |
Allowance for credit loss | 0 |  | 0 |  |  |
Collateral Pledged [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 1,805 |  | 219 |  |  |
Allowance for credit loss | 559 |  | 96 |  |  |
Collateral Pledged [Member] | Agriculture [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 623 |  | 1,310 |  |  |
Allowance for credit loss | 36 |  | 0 |  |  |
Collateral Pledged [Member] | Consumer and Other [Member] |  |  |  |  |  |
Financing Receivable Individually Evaluated For Impairment | 5 |  | 0 |  |  |
Allowance for credit loss | $ 0 |  | $ 0 |  |  |

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