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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 |

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