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Note 1 - Summary of Significant Accounting Policies - Summary of Adoption of New Accounting Standards (Details) - USD ($) | Mar. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | ---
Allowance for loan losses | $ 10,032,000 |  | $ 8,129,000 | $ 6,786,000 | $ 6,715,000
Commercial Portfolio Segment [Member] |  |  |  |  |
Allowance for loan losses | 3,576,000 |  | 2,548,000 | 2,078,000 | 1,652,000
Consumer Portfolio Segment [Member] |  |  |  |  |
Allowance for loan losses | 41,000 |  | 49,000 | 46,000 | 44,000
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses | 354,000 |  | 281,000 | 315,000 | 331,000
Multi-family Mortgage [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses | 4,714,000 |  | 4,017,000 | 3,390,000 | 3,377,000
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses | $ 1,347,000 |  | 1,234,000 | $ 957,000 | $ 1,311,000
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Unfunded commitment reserve |  | $ 417,000 |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Unfunded commitment reserve |  | 417,000 |  |  |
Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Allowance for loan losses |  | 8,129,000 | 8,129,000 |  |
Unfunded commitment reserve |  | 0 |  |  |
Accounting Standards Update 2016-13 [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Allowance for loan losses |  | 2,548,000 | 2,548,000 |  |
Accounting Standards Update 2016-13 [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Allowance for loan losses |  | 49,000 | 49,000 |  |
Accounting Standards Update 2016-13 [Member] | One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses |  | 281,000 | 281,000 |  |
Accounting Standards Update 2016-13 [Member] | Multi-family Mortgage [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses |  | 4,017,000 | 4,017,000 |  |
Accounting Standards Update 2016-13 [Member] | Nonresidential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses |  | 1,234,000 | 1,234,000 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |  |
Allowance for loan losses |  | 10,036,000 | 10,036,000 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Allowance for loan losses |  | 3,670,000 | 3,670,000 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Allowance for loan losses |  | 39,000 | 39,000 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses |  | 380,000 | 380,000 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Multi-family Mortgage [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses |  | 4,647,000 | 4,647,000 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Nonresidential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses |  | 1,300,000 | 1,300,000 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Allowance for loan losses |  | 1,907,000 | 1,907,000 |  |
Unfunded commitment reserve |  | 417,000 |  |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Allowance for loan losses |  | 1,122,000 | 1,122,000 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Consumer Portfolio Segment [Member] |  |  |  |  |
Allowance for loan losses |  | (10,000) | (10,000) |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses |  | 99,000 | 99,000 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Multi-family Mortgage [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses |  | 630,000 | 630,000 |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Nonresidential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |  |  |
Allowance for loan losses |  | $ 66,000 | $ 66,000 |  |

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