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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Loan balance, with no allowance recorded $ 2,508 $ 2,508 $ 1,880
Recorded investment, with no allowance recorded 2,376 2,376 1,873
Partial charge-off, with no allowance recorded 120 120 7
Average investment in impaired loans, with no allowance recorded 2,242 2,052 1,989
Interest income recognized, with no allowance recorded 16 51 59
Loan balance, with no allowance recorded 2,508 2,508 1,880
Recorded investment, with no allowance recorded 2,376 2,376 1,873
Allowance for loan losses 0 0 30
Recorded investment, with no allowance recorded 2,376 2,376 1,873
Recorded investment, with no allowance recorded     2,170
Partial charge-off, with no allowance recorded     14
Allowance for loan losses     30
Average investment in impaired loans, with no allowance recorded     2,285
Interest income recognized, with no related allowance recorded     59
Loan balance, with allowance recorded     2,160
Nonresidential Real Estate Loans [Member]      
Loan balance, with allowance recorded     280
Recorded investment, with no allowance recorded     297
Partial charge-off, with no allowance recorded     7
Allowance for loan losses     30
Average investment in impaired loans, with no allowance recorded     296
Interest income recognized, with no related allowance recorded     0
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]      
Loan balance, with no allowance recorded 1,296 1,296 1,299
Recorded investment, with no allowance recorded 1,224 1,224 1,299
Partial charge-off, with no allowance recorded 72 72 0
Average investment in impaired loans, with no allowance recorded 1,152 1,148 1,473
Interest income recognized, with no allowance recorded 10 21 29
Loan balance, with no allowance recorded 1,296 1,296 1,299
Recorded investment, with no allowance recorded 1,224 1,224 1,299
Allowance for loan losses 0 0 0
Recorded investment, with no allowance recorded 1,224 1,224 1,299
Real Estate Portfolio [Member] | Multi-family Mortgage [Member]      
Allowance for loan losses 0 0 0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | ILLINOIS      
Loan balance, with no allowance recorded 482 482 498
Recorded investment, with no allowance recorded 482 482 498
Partial charge-off, with no allowance recorded 0 0 0
Average investment in impaired loans, with no allowance recorded 483 592 509
Interest income recognized, with no allowance recorded 5 19 30
Loan balance, with no allowance recorded 482 482 498
Recorded investment, with no allowance recorded 482 482 498
Recorded investment, with no allowance recorded 482 482 498
Real Estate Portfolio [Member] | Commercial leases [Member]      
Loan balance, with no allowance recorded 730 730 83
Recorded investment, with no allowance recorded 670 670 76
Partial charge-off, with no allowance recorded 48 48 7
Average investment in impaired loans, with no allowance recorded 607 312 7
Interest income recognized, with no allowance recorded 1 11 0
Loan balance, with no allowance recorded 730 730 83
Recorded investment, with no allowance recorded 670 670 76
Allowance for loan losses 0 0  
Recorded investment, with no allowance recorded $ 670 $ 670 $ 76