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Note 7 - Loans Receivable and Credit Disclosures - Amortized Cost Basis of Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Collateral dependent loans | $ 14,605 |  | $ 14,386 |  |  |
Collateral dependent loans, ACL | 16,118 | $ 16,319 | 15,697 | $ 15,897 | $ 16,420 | $ 16,621
Construction Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  | 0 |  |  |
Collateral dependent loans, ACL | 416 | 412 | 730 | 604 | 606 | 675
Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Collateral dependent loans | 990 |  | 805 |  |  |
Collateral dependent loans, ACL | 3,258 | 3,357 | 3,028 | 3,007 | 2,920 | 2,752
Multifamily [Member] |  |  |  |  |  |
Collateral dependent loans | 2,948 |  | 0 |  |  |
Collateral dependent loans, ACL | 2,495 | 2,524 | 2,493 | 2,310 | 2,517 | 2,501
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Collateral dependent loans | 9,177 |  | 12,853 |  |  |
Collateral dependent loans, ACL | 4,998 | 5,033 | 4,742 | 5,559 | 5,843 | 5,905
Agriculture Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 478 |  | 165 |  |  |
Collateral dependent loans, ACL | 1,229 | 1,214 | 1,625 | 1,598 | 1,692 | 1,584
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Collateral dependent loans | 272 |  | 200 |  |  |
Collateral dependent loans, ACL | 1,874 | 2,014 | 1,153 | 1,099 | 1,125 | 1,170
Agriculture [Member] |  |  |  |  |  |
Collateral dependent loans | 726 |  | 342 |  |  |
Collateral dependent loans, ACL | 1,398 | 1,358 | 1,705 | 1,501 | 1,484 | 1,836
Consumer and Other [Member] |  |  |  |  |  |
Collateral dependent loans | 14 |  | 21 |  |  |
Collateral dependent loans, ACL | 450 | $ 407 | $ 221 | $ 219 | $ 233 | $ 198
Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 13,976 |  |  |  |  |
Real Estate [Member] | Construction Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Real Estate [Member] | Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Collateral dependent loans | 990 |  |  |  |  |
Real Estate [Member] | Multifamily [Member] |  |  |  |  |  |
Collateral dependent loans | 2,948 |  |  |  |  |
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Collateral dependent loans | 9,195 |  |  |  |  |
Real Estate [Member] | Agriculture Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 478 |  |  |  |  |
Real Estate [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Collateral dependent loans | 120 |  |  |  |  |
Real Estate [Member] | Agriculture [Member] |  |  |  |  |  |
Collateral dependent loans | 245 |  |  |  |  |
Real Estate [Member] | Consumer and Other [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Equipment [Member] |  |  |  |  |  |
Collateral dependent loans | 39 |  |  |  |  |
Equipment [Member] | Construction Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Equipment [Member] | Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Equipment [Member] | Multifamily [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Equipment [Member] | Agriculture Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Equipment [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Equipment [Member] | Agriculture [Member] |  |  |  |  |  |
Collateral dependent loans | 39 |  |  |  |  |
Equipment [Member] | Consumer and Other [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Other [Member] |  |  |  |  |  |
Collateral dependent loans | 540 |  |  |  |  |
Other [Member] | Construction Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Other [Member] | Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Other [Member] | Multifamily [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Other [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Other [Member] | Agriculture Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Other [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Collateral dependent loans | 98 |  |  |  |  |
Other [Member] | Agriculture [Member] |  |  |  |  |  |
Collateral dependent loans | 442 |  |  |  |  |
Collateral Pledged [Member] |  |  |  |  |  |
Collateral dependent loans | 14,555 |  |  |  |  |
Collateral dependent loans, ACL | 229 |  |  |  |  |
Collateral Pledged [Member] | Construction Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Collateral dependent loans, ACL | 0 |  |  |  |  |
Collateral Pledged [Member] | Family Residential Real Estate 1-4 [Member] |  |  |  |  |  |
Collateral dependent loans | 990 |  |  |  |  |
Collateral dependent loans, ACL | 81 |  |  |  |  |
Collateral Pledged [Member] | Multifamily [Member] |  |  |  |  |  |
Collateral dependent loans | 2,948 |  |  |  |  |
Collateral dependent loans, ACL | 0 |  |  |  |  |
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Collateral dependent loans | 9,195 |  |  |  |  |
Collateral dependent loans, ACL | 0 |  |  |  |  |
Collateral Pledged [Member] | Agriculture Real Estate [Member] |  |  |  |  |  |
Collateral dependent loans | 478 |  |  |  |  |
Collateral dependent loans, ACL | 0 |  |  |  |  |
Collateral Pledged [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Collateral dependent loans | 218 |  |  |  |  |
Collateral dependent loans, ACL | 95 |  |  |  |  |
Collateral Pledged [Member] | Agriculture [Member] |  |  |  |  |  |
Collateral dependent loans | 726 |  |  |  |  |
Collateral dependent loans, ACL | 53 |  |  |  |  |
Collateral Pledged [Member] | Consumer and Other [Member] |  |  |  |  |  |
Collateral dependent loans | 0 |  |  |  |  |
Collateral dependent loans, ACL | $ 0 |  |  |  |  |

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