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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Loan balance, with no allowance recorded $ 2,316 $ 2,589
Recorded investment, with no allowance recorded 2,083 2,238
Partial charge-off, with no allowance recorded 236 363
Average investment in impaired loans, with no allowance recorded 2,152 2,376
Interest income recognized, with no related allowance recorded 15 73
Recorded investment, with an allowance recorded 2,379 2,534
Partial charge-off, with allowance recorded 236 363
Allowance for loan losses 28 28
Average investment in impaired loans, with allowance recorded 2,448 2,665
Interest income recognized, with related allowance recorded 15 73
Loan balance, with allowance recorded 2,596 2,869
Recorded investment, with no allowance recorded 2,083 2,238
Loan balance, with allowance recorded 2,596 2,869
Nonresidential Real Estate Loans [Member]    
Loan balance, with allowance recorded 280 280
Recorded investment, with an allowance recorded 296 296
Partial charge-off, with allowance recorded 0 0
Allowance for loan losses 28 28
Average investment in impaired loans, with allowance recorded 296 289
Interest income recognized, with related allowance recorded 0 0
Loan balance, with allowance recorded 280 280
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member]    
Loan balance, with no allowance recorded 1,801 2,069
Recorded investment, with no allowance recorded 1,568 1,718
Partial charge-off, with no allowance recorded 236 363
Average investment in impaired loans, with no allowance recorded 1,634 1,782
Interest income recognized, with no related allowance recorded 8 42
Recorded investment, with no allowance recorded 1,568 1,718
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | ILLINOIS    
Loan balance, with no allowance recorded 515 520
Recorded investment, with no allowance recorded 515 520
Partial charge-off, with no allowance recorded 0 0
Average investment in impaired loans, with no allowance recorded 518 594
Interest income recognized, with no related allowance recorded 7 31
Recorded investment, with no allowance recorded $ 515 $ 520