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Note 4 - Loans Receivable - Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Loans receivable | $ 1,114,163 |  | $ 1,234,872 |  |  |
Allowance for credit losses | (8,559) | $ (9,226) | (8,129) | $ (7,386) | $ (7,202) | $ (6,715)
Loans, net | 1,105,604 |  | 1,226,743 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Loans receivable | 447,687 |  | 553,056 |  |  |
Allowance for credit losses | (2,535) | (2,943) | (2,548) | (2,231) | (2,149) | (1,652)
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Loans receivable | 1,351 |  | 1,584 |  |  |
Allowance for credit losses | (31) | (33) | (49) | (112) | (42) | (44)
One-to-Four Family Residential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |  |  |  |
Loans receivable | 19,233 |  | 23,133 |  |  |
Allowance for credit losses | (296) | (326) | (281) | (315) | (286) | (331)
Multi-family Mortgage [Member] | Real Estate Portfolio [Member] |  |  |  |  |  |
Loans receivable | 528,251 |  | 537,394 |  |  |
Allowance for credit losses | (4,547) | (4,679) | (4,017) | (3,566) | (3,632) | (3,377)
Nonresidential Real Estate [Member] | Real Estate Portfolio [Member] |  |  |  |  |  |
Loans receivable | 117,641 |  | 119,705 |  |  |
Allowance for credit losses | $ (1,150) | $ (1,245) | $ (1,234) | $ (1,162) | $ (1,093) | $ (1,311)

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