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Note 3 - Loans Receivable (Details Textual)
Pure in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Financing Receivable, before Allowance for Credit Loss $ 1,664,273,000   $ 1,664,273,000     $ 1,680,576,000    
Financing Receivable, Nonaccrual 8,196,000   8,196,000     5,665,000    
Financing Receivable, Allowance for Credit Loss $ 17,800,000 $ 18,414,000 $ 17,800,000 $ 18,414,000 $ 17,905,000 18,247,000 $ 18,549,000 $ 18,549,000
Financing Receivable, Modified, Number of Contracts 0 0 0 0        
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0 0 0        
Unfunded Loan Commitment [Member]                
Financing Receivable, Allowance for Credit Loss $ 1,100,000   $ 1,100,000     1,200,000    
One to Four Family [Member] | Residential Portfolio Segment [Member]                
Financing Receivable, before Allowance for Credit Loss 503,343,000   503,343,000     516,128,000    
Financing Receivable, Nonaccrual 7,673,000   7,673,000     5,515,000    
Financing Receivable, Allowance for Credit Loss 5,110,000 $ 5,838,000 5,110,000 $ 5,838,000 $ 4,979,000 5,286,000 $ 6,609,000 $ 6,886,000
Mortgage Loans in Process of Foreclosure, Amount 3,100,000   3,100,000     1,900,000    
Financial Asset, 1 to 59 Days Past Due [Member]                
Financing Receivable, before Allowance for Credit Loss [1] 4,059,000   4,059,000     9,732,000    
Financing Receivable, Nonaccrual 593,000   593,000     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] 3,800,000   3,800,000     9,107,000    
Financial Asset, 60 to 89 Days Past Due [Member]                
Financing Receivable, before Allowance for Credit Loss [2] 1,084,000   1,084,000     1,405,000    
Financing Receivable, Nonaccrual 0   0     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] 1,008,000   1,008,000     1,405,000    
Financial Asset, Not Past Due [Member]                
Financing Receivable, before Allowance for Credit Loss [3] 1,652,774,000   1,652,774,000     1,665,454,000    
Financing Receivable, Nonaccrual 1,200,000   1,200,000     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] 492,450,000   492,450,000     501,661,000    
Federal Home Loan Bank of Chicago [Member]                
Federal Home Loan Bank, Advance 452,201,000   452,201,000     443,553,000    
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member]                
Financing Receivable, before Allowance for Credit Loss $ 1,230,000,000   $ 1,230,000,000     $ 1,230,000,000    
[1] Includes $221,000 and $522,000 at March 31, 2025 and December 31, 2024, respectively, which are on non-accrual status.
[2] Includes $ - and $1.1 million March 31, 2025 and December 31, 2024, respectively, which are on non-accrual status.
[3] Includes $1.1 million and $28,000 at March 31, 2025 and December 31, 2024, respectively, which are on non-accrual status.