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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Loan balance, with no allowance recorded $ 2,589 $ 3,068
Recorded investment, with no allowance recorded 2,238 2,743
Partial charge-off, with no allowance recorded 363 339
Average investment in impaired loans, with no allowance recorded 2,376 3,434
Interest income recognized, with no related allowance recorded 73 90
Loan balance, with allowance recorded 2,869  
With an allowance recorded, recorded investment 2,534  
Partial charge-off, with an allowance recorded 363  
Allowance for loan losses 28  
Average investment in impaired loans, with an allowance recorded 2,665  
Interest income recognized, with a related allowance recorded 73  
Nonresidential Real Estate Loans [Member]    
Loan balance, with allowance recorded 280  
With an allowance recorded, recorded investment 296  
Partial charge-off, with an allowance recorded 0  
Allowance for loan losses 28  
Average investment in impaired loans, with an allowance recorded 289  
Interest income recognized, with a related allowance recorded 0  
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]    
Loan balance, with no allowance recorded 2,069 2,168
Recorded investment, with no allowance recorded 1,718 1,835
Partial charge-off, with no allowance recorded 363 339
Average investment in impaired loans, with no allowance recorded 1,782 2,208
Interest income recognized, with no related allowance recorded 42 51
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | ILLINOIS    
Loan balance, with no allowance recorded 520  
Recorded investment, with no allowance recorded 520  
Partial charge-off, with no allowance recorded 0  
Average investment in impaired loans, with no allowance recorded 594  
Interest income recognized, with no related allowance recorded $ 31  
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member]    
Loan balance, with no allowance recorded   280
Recorded investment, with no allowance recorded   288
Partial charge-off, with no allowance recorded   0
Average investment in impaired loans, with no allowance recorded   589
Interest income recognized, with no related allowance recorded   2
Commercial Portfolio Segment [Member] | Other [Member]    
Loan balance, with no allowance recorded   620
Recorded investment, with no allowance recorded   620
Partial charge-off, with no allowance recorded   0
Average investment in impaired loans, with no allowance recorded   637
Interest income recognized, with no related allowance recorded   $ 37