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Note 3 - Loans and Allowance for Loan Losses - Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Beginning balance | $ 1,176 | $ 624 | $ 624
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 |
Net recoveries (charge-offs) | 0 | 0 |
(Release of) provision for credit losses | 1 | (29) |
Ending balance | 1,177 | 979 | 1,176
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Beginning balance |  | 384 | 384
First Mortgage Loans [Member] | One To Four Family Residential [Member] |  |  |
Beginning balance | 1,094 | 581 | 581
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 |
Net recoveries (charge-offs) | 0 | 0 |
(Release of) provision for credit losses | (3) | (26) |
Ending balance | 1,091 | 890 | 1,094
First Mortgage Loans [Member] | One To Four Family Residential [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Beginning balance |  | 335 | 335
First Mortgage Loans [Member] | Multifamily [Member] |  |  |
Beginning balance | 40 | 19 | 19
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 |
Net recoveries (charge-offs) | 0 | 0 |
(Release of) provision for credit losses | (4) | (1) |
Ending balance | 36 | 41 | 40
First Mortgage Loans [Member] | Multifamily [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Beginning balance |  | 23 | 23
First Mortgage Loans [Member] | Commercial Real Estate [Member] |  |  |
Beginning balance | 37 | 19 | 19
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 |
Net recoveries (charge-offs) | 0 | 0 |
(Release of) provision for credit losses | 0 | (2) |
Ending balance | 37 | 46 | 37
First Mortgage Loans [Member] | Commercial Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Beginning balance |  | 29 | 29
First Mortgage Loans [Member] | Construction Loans [Member] |  |  |
Beginning balance | 4 | 0 | 0
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 0 |
Net recoveries (charge-offs) | 0 | 0 |
(Release of) provision for credit losses | 7 | 0 |
Ending balance | 11 | 0 | 4
First Mortgage Loans [Member] | Construction Loans [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Beginning balance |  | 0 | 0
Consumer Portfolio Segment [Member] |  |  |
Beginning balance | 1 | 5 | 5
Charge-offs | 0 | 0 |
Recoveries | 0 | 0 |
Net recoveries (charge-offs) | 0 | 0 |
(Release of) provision for credit losses | 1 | 0 |
Ending balance | $ 2 | 2 | 1
Consumer Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Beginning balance |  | $ (3) | $ (3)

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