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Note 4 - Loans Receivable - Allowance for Loan Losses and Loans Receivable (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Loan balances, individually evaluated for impairment | $ 9,334 |  | $ 17,012 |  |  |
Loan balances, collectively evaluated for impairment | 759,312 |  | 878,145 |  |  |
Loans receivable | 768,646 |  | 895,157 |  |  |
Allowance for loans individually evaluated | 2,075 |  | 0 |  |  |
Allowance for loans collectively evaluated | 6,739 |  | 7,571 |  |  |
Allowance for credit loss | 8,814 | $ 9,116 | 7,571 | $ 7,899 | $ 8,142 | $ 8,345
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member] |  |  |  |  |  |
Loan balances, individually evaluated for impairment | 27 |  | 148 |  |  |
Loan balances, collectively evaluated for impairment | 12,832 |  | 14,681 |  |  |
Loans receivable | 12,859 |  | 14,829 |  |  |
Allowance for loans individually evaluated | 0 |  | 0 |  |  |
Allowance for loans collectively evaluated | 226 |  | 271 |  |  |
Allowance for credit loss | 226 |  | 271 |  |  |
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] |  |  |  |  |  |
Loan balances, individually evaluated for impairment | 0 |  | 1,453 |  |  |
Loan balances, collectively evaluated for impairment | 486,050 |  | 520,504 |  |  |
Loans receivable | 486,050 |  | 521,957 |  |  |
Allowance for loans individually evaluated | 0 |  | 0 |  |  |
Allowance for loans collectively evaluated | 4,606 |  | 4,764 |  |  |
Allowance for credit loss | 4,606 |  | 4,764 |  |  |
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] |  |  |  |  |  |
Loan balances, individually evaluated for impairment | 0 |  | 393 |  |  |
Loan balances, collectively evaluated for impairment | 98,804 |  | 107,760 |  |  |
Loans receivable | 98,804 |  | 108,153 |  |  |
Allowance for loans individually evaluated | 0 |  | 0 |  |  |
Allowance for loans collectively evaluated | 1,153 |  | 1,342 |  |  |
Allowance for credit loss | 1,153 |  | 1,342 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Loan balances, individually evaluated for impairment | 9,307 |  | 15,018 |  |  |
Loan balances, collectively evaluated for impairment | 160,028 |  | 233,577 |  |  |
Loans receivable | 169,335 |  | 248,595 |  |  |
Allowance for loans individually evaluated | 2,075 |  | 0 |  |  |
Allowance for loans collectively evaluated | 714 |  | 1,146 |  |  |
Allowance for credit loss | 2,789 |  | 1,146 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Loan balances, individually evaluated for impairment | 0 |  | 0 |  |  |
Loan balances, collectively evaluated for impairment | 1,598 |  | 1,623 |  |  |
Loans receivable | 1,598 |  | 1,623 |  |  |
Allowance for loans individually evaluated | 0 |  | 0 |  |  |
Allowance for loans collectively evaluated | 40 |  | 48 |  |  |
Allowance for credit loss | $ 40 | $ 44 | $ 48 |  |  |

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- Definition Amount of allowance for credit loss on financing receivable evaluated on collective basis. Excludes financing receivable evaluated on individual basis. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.5.a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480418/310-10-S99-4 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479391/326-20-30-2 + Details
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