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Note 3 - Loans Receivable (Details Textual) Pure in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Financing Receivable, before Allowance for Credit Loss |  |  |  | $ 1,714,836,000 |  | $ 1,680,576,000 |  |
Financing Receivable, Nonaccrual |  |  |  | 5,996,000 |  | 5,665,000 |  |
Financing Receivable, Allowance for Credit Loss |  | $ 18,198,000 | $ 18,198,000 | 17,670,000 | $ 17,800,000 | 18,247,000 | $ 18,414,000 | $ 18,549,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts |  | 0 | 0 |  |  |  |  |
Unfunded Loan Commitment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  | 1,000,000 |  | 1,200,000 |  |
One to Four Family [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  |  | 506,758,000 |  | 516,128,000 |  |
Financing Receivable, Nonaccrual |  |  |  | 5,674,000 |  | 5,515,000 |  |
Financing Receivable, Allowance for Credit Loss |  | $ 5,326,000 | $ 5,326,000 | 4,948,000 | $ 5,110,000 | 5,286,000 | $ 5,838,000 | $ 6,886,000
Mortgage Loans in Process of Foreclosure, Amount |  |  |  | 1,800,000 |  | 1,900,000 |  |
Financial Asset, 1 to 59 Days Past Due [Member] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [1] |  |  | 2,374,000 |  | 9,732,000 |  |
Financing Receivable, Nonaccrual |  |  |  | 489,000 |  | 522,000 |  |
Financial Asset, 1 to 59 Days Past Due [Member] | One to Four Family [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [1] |  |  | 2,208,000 |  | 9,107,000 |  |
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [2] |  |  | 1,962,000 |  | 1,405,000 |  |
Financing Receivable, Nonaccrual |  |  |  | 590,000 |  | 1,100,000 |  |
Financial Asset, 60 to 89 Days Past Due [Member] | One to Four Family [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [2] |  |  | 1,962,000 |  | 1,405,000 |  |
Financial Asset, Not Past Due [Member] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [3] |  |  | 1,706,316,000 |  | 1,665,454,000 |  |
Financing Receivable, Nonaccrual |  |  |  | 733,000 |  | 28,000 |  |
Financial Asset, Not Past Due [Member] | One to Four Family [Member] | Residential Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss | [3] |  |  | 498,586,000 |  | 501,661,000 |  |
Federal Home Loan Bank of Chicago [Member] |  |  |  |  |  |  |  |
Federal Home Loan Bank, Advance |  |  |  | 460,166,000 |  | 443,553,000 |  |
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member] |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss |  |  |  | $ 1,220,000,000 |  | $ 1,230,000,000 |  |
[1] | Includes $489,000 and $522,000 at September 30, 2025 and December 31, 2024, respectively, which are on non-accrual status.
[2] | Includes $ 590,000 and $1.1 million September 30, 2025 and December 31, 2024, respectively, which are on non-accrual status.
[3] | Includes $733,000 and $28,000 at September 30, 2025 and December 31, 2024, respectively, which are on non-accrual status.

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