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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.