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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, 2021
Sep. 30, 2021
Dec. 31, 2020
Loan balance, with no allowance recorded $ 1,977 $ 1,977 $ 2,589
Recorded investment, with no allowance recorded 1,866 1,866 2,238
Partial charge-off, with no allowance recorded 111 111 363
Average investment in impaired loans, with no allowance recorded 1,936 2,037 2,376
Interest income recognized, with no allowance recorded 14 45 73
Loan balance, with allowance recorded 2,257 2,257  
With an allowance recorded, recorded investment 2,162 2,162 2,534
Partial charge-off, with allowance recorded 111 111 363
Allowance for loan losses 28 28 28
Average investment in impaired loans, with allowance recorded 2,232 2,333 2,665
Interest income recognized, with related allowance recorded 14 45 73
Loan balance, with no allowance recorded 1,977 1,977 2,589
Recorded investment, with no allowance recorded 1,866 1,866 2,238
Loan balance, with allowance recorded 2,257 2,257  
Allowance for loan losses     28
Loan balance, with allowance recorded     2,869
Nonresidential Real Estate Loans [Member]      
Loan balance, with allowance recorded 280 280 280
With an allowance recorded, recorded investment 296 296 296
Partial charge-off, with allowance recorded 0 0 0
Allowance for loan losses 28 28  
Average investment in impaired loans, with allowance recorded 296 296 289
Interest income recognized, with related allowance recorded 0 0 0
Loan balance, with allowance recorded 280 280 280
Allowance for loan losses     28
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]      
Loan balance, with no allowance recorded 1,465 1,465 2,069
Recorded investment, with no allowance recorded 1,354 1,354 1,718
Partial charge-off, with no allowance recorded 111 111 363
Average investment in impaired loans, with no allowance recorded 1,428 1,524 1,782
Interest income recognized, with no allowance recorded 7 23 42
Allowance for loan losses 0 0 0
Loan balance, with no allowance recorded 1,465 1,465 2,069
Recorded investment, with no allowance recorded 1,354 1,354 1,718
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 503 503 520
Recorded investment, with no allowance recorded 503 503 520
Partial charge-off, with no allowance recorded 0 0 0
Average investment in impaired loans, with no allowance recorded 506 512 594
Interest income recognized, with no allowance recorded 7 22 31
Loan balance, with no allowance recorded 503 503 520
Recorded investment, with no allowance recorded 503 503 $ 520
Finance Leases Portfolio Segment [Member] | Investment Rated Commercial Leases [Member]      
Loan balance, with no allowance recorded 9 9  
Recorded investment, with no allowance recorded 9 9  
Partial charge-off, with no allowance recorded 0 0  
Average investment in impaired loans, with no allowance recorded 2 1  
Interest income recognized, with no allowance recorded 0 0  
Loan balance, with no allowance recorded 9 9  
Recorded investment, with no allowance recorded $ 9 $ 9