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Note 4 - Loans Receivable - Risk Categories of Loans By Class of Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Loans receivable $ 848,334 $ 895,157
Current period net, current year 0  
Current period net, one year before 0  
Current period net, two years before 0  
Current period net, three years before 0  
Current period net, four years before 0  
Current period net, prior 0  
Current period net, revolving (9)  
Current period net, total (9)  
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]    
Loans receivable 14,090 14,829
Financing Receivable, current year 73 0
Financing Receivable, one year before 0 484
Financing Receivable, two years before 482 0
Financing Receivable, three years before 0 0
Financing Receivable, four years before 0 34
Financing Receivable, prior 10,598 11,089
Financing Receivable, revolving 2,937 3,222
Current period recoveries, current year 0 0
Current period recoveries, one year before 0 0
Current period recoveries, two years before 0 0
Current period recoveries, three years before 0 0
Current period recoveries, four years before 0 0
Current period recoveries, prior 2 28
Current period recoveries, revolving 0 0
Current period recoveries, total 2 28
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]    
Loans receivable 506,498 521,957
Financing Receivable, current year 2,432 33,812
Financing Receivable, one year before 33,583 38,444
Financing Receivable, two years before 38,163 204,590
Financing Receivable, three years before 195,846 107,420
Financing Receivable, four years before 105,532 55,129
Financing Receivable, prior 125,709 76,940
Financing Receivable, revolving 5,233 5,622
Current period recoveries, current year 0 0
Current period recoveries, one year before 0 0
Current period recoveries, two years before 0 0
Current period recoveries, three years before 0 0
Current period recoveries, four years before 0 0
Current period recoveries, prior 2 18
Current period recoveries, revolving 0 0
Current period recoveries, total 2 18
Current period gross charge-offs, current year   0
Current period gross charge-offs, one year before   0
Current period gross charge-offs, two years before   (5)
Current period gross charge-offs, three years before   0
Current period gross charge-offs, four years before   0
Current period gross charge-offs, prior   0
Current period gross charge-offs, revolving   0
Current period gross charge-offs, total   (5)
Current period net, current year   0
Current period net, one year before   0
Current period net, two years before   (5)
Current period net, three years before   0
Current period net, four years before   0
Current period net, prior   18
Current period net, revolving   0
Current period net, total   13
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]    
Loans receivable 104,610 108,153
Financing Receivable, current year 433 17,201
Financing Receivable, one year before 16,357 14,355
Financing Receivable, two years before 14,243 47,580
Financing Receivable, three years before 46,827 14,771
Financing Receivable, four years before 14,545 7,335
Financing Receivable, prior 11,294 5,998
Financing Receivable, revolving 911 913
Commercial Portfolio Segment [Member]    
Loans receivable 221,403 248,595
Financing Receivable, current year 5,489 27,360
Financing Receivable, one year before 26,434 32,572
Financing Receivable, two years before 28,575 87,396
Financing Receivable, three years before 76,791 30,804
Financing Receivable, four years before 25,637 10,131
Financing Receivable, prior 5,747 723
Financing Receivable, revolving 52,730 59,609
Current period recoveries, current year 0 0
Current period recoveries, one year before 0 0
Current period recoveries, two years before 8 1
Current period recoveries, three years before 2 5
Current period recoveries, four years before 0 7
Current period recoveries, prior 0 1
Current period recoveries, revolving 0 0
Current period recoveries, total 10 14
Current period gross charge-offs, current year 0 0
Current period gross charge-offs, one year before 0 (332)
Current period gross charge-offs, two years before (10) (4,998)
Current period gross charge-offs, three years before (26) (44)
Current period gross charge-offs, four years before 0 (493)
Current period gross charge-offs, prior 0 0
Current period gross charge-offs, revolving 0 0
Current period gross charge-offs, total (36) (5,867)
Current period net, current year 0 0
Current period net, one year before 0 (332)
Current period net, two years before (2) (4,997)
Current period net, three years before (24) (39)
Current period net, four years before 0 (486)
Current period net, prior 0 1
Current period net, revolving 0 0
Current period net, total (26) (5,853)
Consumer Portfolio Segment [Member]    
Loans receivable 1,733 1,623
Financing Receivable, current year 15 790
Financing Receivable, one year before 723 169
Financing Receivable, two years before 160 3
Financing Receivable, three years before 3 20
Financing Receivable, four years before 20 49
Financing Receivable, prior 48 0
Financing Receivable, revolving 764 592
Current period recoveries, current year 0 0
Current period recoveries, one year before 0 0
Current period recoveries, two years before 0 0
Current period recoveries, three years before 0 0
Current period recoveries, four years before 0 0
Current period recoveries, prior 0 0
Current period recoveries, revolving 1 1
Current period recoveries, total 1 1
Current period gross charge-offs, current year 0 0
Current period gross charge-offs, one year before 0 0
Current period gross charge-offs, two years before 0 0
Current period gross charge-offs, three years before 0 0
Current period gross charge-offs, four years before 0 0
Current period gross charge-offs, prior 0 0
Current period gross charge-offs, revolving (10) (44)
Current period gross charge-offs, total (10) (44)
Current period net, current year   0
Current period net, one year before   0
Current period net, two years before   0
Current period net, three years before   0
Current period net, four years before   0
Current period net, prior   0
Current period net, revolving   (43)
Current period net, total   (43)
Pass [Member]    
Loans receivable 819,587 866,318
Pass [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]    
Loans receivable 13,808 14,485
Financing Receivable, current year 0 0
Financing Receivable, one year before 0 484
Financing Receivable, two years before 482 0
Financing Receivable, three years before 0 0
Financing Receivable, four years before 0 34
Financing Receivable, prior 10,425 10,897
Financing Receivable, revolving 2,901 3,070
Pass [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]    
Loans receivable 496,103 515,478
Financing Receivable, current year 2,432 33,812
Financing Receivable, one year before 33,583 38,228
Financing Receivable, two years before 38,022 199,495
Financing Receivable, three years before 190,752 107,420
Financing Receivable, four years before 101,536 55,129
Financing Receivable, prior 124,545 75,772
Financing Receivable, revolving 5,233 5,622
Pass [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]    
Loans receivable 103,752 106,891
Financing Receivable, current year 0 16,760
Financing Receivable, one year before 16,357 14,355
Financing Receivable, two years before 14,243 46,759
Financing Receivable, three years before 46,402 14,771
Financing Receivable, four years before 14,545 7,335
Financing Receivable, prior 11,294 5,998
Financing Receivable, revolving 911 913
Pass [Member] | Commercial Portfolio Segment [Member]    
Loans receivable 204,196 227,851
Financing Receivable, current year 5,489 27,360
Financing Receivable, one year before 26,434 32,517
Financing Receivable, two years before 28,525 72,546
Financing Receivable, three years before 61,972 30,764
Financing Receivable, four years before 25,597 9,973
Financing Receivable, prior 5,649 723
Financing Receivable, revolving 50,530 53,968
Pass [Member] | Consumer Portfolio Segment [Member]    
Loans receivable 1,728 1,613
Financing Receivable, current year 15 788
Financing Receivable, one year before 722 169
Financing Receivable, two years before 160 3
Financing Receivable, three years before 3 20
Financing Receivable, four years before 20 49
Financing Receivable, prior 48 0
Financing Receivable, revolving 760 584
Special Mention [Member]    
Loans receivable 493 7,446
Special Mention [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]    
Loans receivable 0 0
Special Mention [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]    
Loans receivable 0 3,858
Financing Receivable, current year   0
Financing Receivable, one year before   0
Financing Receivable, two years before   3,858
Financing Receivable, three years before   0
Financing Receivable, four years before   0
Financing Receivable, prior   0
Financing Receivable, revolving   0
Special Mention [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]    
Loans receivable 425 428
Financing Receivable, current year 0 0
Financing Receivable, one year before 0 0
Financing Receivable, two years before 0 428
Financing Receivable, three years before 425 0
Financing Receivable, four years before 0 0
Financing Receivable, prior 0 0
Financing Receivable, revolving 0 0
Special Mention [Member] | Commercial Portfolio Segment [Member]    
Loans receivable 66 3,156
Financing Receivable, current year 0 0
Financing Receivable, one year before 0 0
Financing Receivable, two years before 0 0
Financing Receivable, three years before 66 0
Financing Receivable, four years before 0 0
Financing Receivable, prior 0 0
Financing Receivable, revolving 0 3,156
Special Mention [Member] | Consumer Portfolio Segment [Member]    
Loans receivable 2 4
Financing Receivable, current year 0 0
Financing Receivable, one year before 0 0
Financing Receivable, two years before 0 0
Financing Receivable, three years before 0 0
Financing Receivable, four years before 0 0
Financing Receivable, prior 0 0
Financing Receivable, revolving 2 4
Substandard [Member]    
Loans receivable 11,841 4,459
Substandard [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]    
Loans receivable 175 218
Financing Receivable, current year 73 0
Financing Receivable, one year before 0 0
Financing Receivable, two years before 0 0
Financing Receivable, three years before 0 0
Financing Receivable, four years before 0 0
Financing Receivable, prior 80 81
Financing Receivable, revolving 22 137
Substandard [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]    
Loans receivable 9,000 1,168
Financing Receivable, current year 0 0
Financing Receivable, one year before 0 0
Financing Receivable, two years before 0 0
Financing Receivable, three years before 3,840 0
Financing Receivable, four years before 3,996 0
Financing Receivable, prior 1,164 1,168
Financing Receivable, revolving 0 0
Substandard [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]    
Loans receivable 433 441
Financing Receivable, current year 433 441
Financing Receivable, one year before 0 0
Financing Receivable, two years before 0 0
Financing Receivable, three years before 0 0
Financing Receivable, four years before 0 0
Financing Receivable, prior 0 0
Financing Receivable, revolving 0 0
Substandard [Member] | Commercial Portfolio Segment [Member]    
Loans receivable 2,230 2,628
Financing Receivable, current year 0 0
Financing Receivable, one year before 0 0
Financing Receivable, two years before 0 103
Financing Receivable, three years before 30 40
Financing Receivable, four years before 0 0
Financing Receivable, prior 0 0
Financing Receivable, revolving 2,200 2,485
Substandard [Member] | Consumer Portfolio Segment [Member]    
Loans receivable 3 4
Financing Receivable, current year 0 0
Financing Receivable, one year before 1 0
Financing Receivable, two years before 0 0
Financing Receivable, three years before 0 0
Financing Receivable, four years before 0 0
Financing Receivable, prior 0 0
Financing Receivable, revolving 2 4
Substandard Nonaccrual [Member]    
Loans receivable 16,413 16,934
Substandard Nonaccrual [Member] | Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]    
Loans receivable 107 126
Financing Receivable, current year 0 0
Financing Receivable, one year before 0 0
Financing Receivable, two years before 0 0
Financing Receivable, three years before 0 0
Financing Receivable, four years before 0 0
Financing Receivable, prior 93 111
Financing Receivable, revolving 14 15
Substandard Nonaccrual [Member] | Real Estate Portfolio [Member] | Multi-family Mortgage [Member]    
Loans receivable 1,395 1,453
Financing Receivable, current year 0 0
Financing Receivable, one year before 0 216
Financing Receivable, two years before 141 1,237
Financing Receivable, three years before 1,254 0
Financing Receivable, four years before 0 0
Financing Receivable, prior 0 0
Financing Receivable, revolving 0 0
Substandard Nonaccrual [Member] | Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]    
Loans receivable 0 393
Financing Receivable, current year   0
Financing Receivable, one year before   0
Financing Receivable, two years before   393
Financing Receivable, three years before   0
Financing Receivable, four years before   0
Financing Receivable, prior   0
Financing Receivable, revolving   0
Substandard Nonaccrual [Member] | Commercial Portfolio Segment [Member]    
Loans receivable 14,911 14,960
Financing Receivable, current year 0 0
Financing Receivable, one year before 0 55
Financing Receivable, two years before 50 14,747
Financing Receivable, three years before 14,723 0
Financing Receivable, four years before 40 158
Financing Receivable, prior 98 0
Financing Receivable, revolving 0 0
Substandard Nonaccrual [Member] | Consumer Portfolio Segment [Member]    
Loans receivable $ 0 2
Financing Receivable, current year   2
Financing Receivable, one year before   0
Financing Receivable, two years before   0
Financing Receivable, three years before   0
Financing Receivable, four years before   0
Financing Receivable, prior   0
Financing Receivable, revolving   $ 0