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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Loan balance, with no allowance recorded | $ 1,880 | $ 2,589
Recorded investment, with no allowance recorded | 1,873 | 2,238
Partial charge-off, with no allowance recorded | 7 | 363
Average investment in impaired loans, with no allowance recorded | 1,989 | 2,376
Interest income recognized, with no allowance recorded | 59 | 73
Allowance for loan losses | 30 | 28
Loan balance | 2,160 | 2,869
Recorded investment | 2,170 | 2,534
Partial charge-off | 14 | 363
Allowance for loan losses, individually evaluated for impairment | 30 | 28
Average investment in impaired loans | 2,285 | 2,665
Interest income recognized, with related allowance recorded |  | 73
Recorded investment | 2,170 | 2,534
Nonresidential Real Estate Loans [Member] |  |
Interest income recognized, with no allowance recorded | 0 |
Loan balance, with allowance recorded | 280 | 280
Recorded investment, with allowance recorded | 297 | 296
Partial charge-off, with allowance recorded | 7 | 0
Allowance for loan losses | 30 | 28
Average investment in impaired loans, with allowance recorded | 296 | 289
Allowance for loan losses, individually evaluated for impairment | 30 | 28
Recorded investment, with allowance recorded | 297 | 296
Interest income recognized, with related allowance recorded |  | 0
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member] |  |
Loan balance, with no allowance recorded | 1,299 | 2,069
Recorded investment, with no allowance recorded | 1,299 | 1,718
Partial charge-off, with no allowance recorded | 0 | 363
Average investment in impaired loans, with no allowance recorded | 1,473 | 1,782
Interest income recognized, with no allowance recorded | 29 | 42
Allowance for loan losses | 0 | 0
Allowance for loan losses, individually evaluated for impairment | 0 | 0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] |  |
Allowance for loan losses | 0 | 0
Allowance for loan losses, individually evaluated for impairment | 0 | 0
Real Estate Portfolio [Member] | Multi-family Mortgage [Member] | ILLINOIS |  |
Loan balance, with no allowance recorded | 498 |
Recorded investment, with no allowance recorded | 498 |
Average investment in impaired loans, with no allowance recorded | 509 |
Interest income recognized, with no allowance recorded | 30 |
Real Estate Portfolio [Member] | Commercial leases [Member] |  |
Loan balance, with no allowance recorded | 83 |
Recorded investment, with no allowance recorded | 76 |
Partial charge-off, with no allowance recorded | 7 |
Average investment in impaired loans, with no allowance recorded | 7 |
Interest income recognized, with no allowance recorded | 0 |
Commercial Portfolio Segment [Member] |  |
Allowance for loan losses | 0 | 0
Allowance for loan losses, individually evaluated for impairment | $ 0 | 0
Commercial Portfolio Segment [Member] | Other [Member] |  |
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 allowance recorded |  | $ 31

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