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Note 4 - Loans Receivable - Loans Individually Evaluated for Impairment By Class (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Loan balance, with no allowance recorded | $ 4,425,000 | $ 4,425,000 | $ 3,068,000
Recorded investment, with no allowance recorded | 4,079,000 | 4,079,000 | 2,743,000
Partial charge-off, with no allowance recorded | 358,000 | 358,000 | 339,000
Average investment in impaired loans, with no allowance recorded | 3,629,000 | 2,981,000 | 3,434,000
Interest income recognized, with no allowance recorded | 45,000 | 119,000 | 90,000
Impaired Financing Receivable, Related Allowance | 20,000 | 20,000 |
Loan balance | 4,705,000 | 4,705,000 |
Recorded investment | 4,367,000 | 4,367,000 |
Partial charge-off | 358,000 | 358,000 |
Average investment in impaired loans | 3,917,000 | 3,269,000 |
Interest income recognized | 45,000 | 119,000 |
Allowance for loan losses | 20,000 | 20,000 | 0
Nonresidential Real Estate [Member] |  |  |
Loan balance, with no allowance recorded |  |  | 280,000
Recorded investment, with no allowance recorded |  |  | 288,000
Partial charge-off, with no allowance recorded |  |  | 0
Average investment in impaired loans, with no allowance recorded |  |  | 589,000
Interest income recognized, with no allowance recorded |  |  | 2,000
Allowance for loan losses |  |  | 0
Real Estate Portfolio [Member] | One-to-Four Family Residential Real Estate [Member] |  |  |
Loan balance, with no allowance recorded | 2,092,000 | 2,092,000 | 2,168,000
Recorded investment, with no allowance recorded | 1,746,000 | 1,746,000 | 1,835,000
Partial charge-off, with no allowance recorded | 358,000 | 358,000 | 339,000
Average investment in impaired loans, with no allowance recorded | 1,760,000 | 1,798,000 | 2,208,000
Interest income recognized, with no allowance recorded | 10,000 | 34,000 | 51,000
Allowance for loan losses | 0 | 0 | 0
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 | 596,000 | 596,000 | 620,000
Recorded investment, with no allowance recorded | 596,000 | 596,000 | 620,000
Partial charge-off, with no allowance recorded | 0 | 0 | 0
Average investment in impaired loans, with no allowance recorded | 600,000 | 608,000 | 637,000
Interest income recognized, with no allowance recorded | 8,000 | 26,000 | 37,000
Allowance for loan losses |  |  | 0
Real Estate Portfolio [Member] | Nonresidential Real Estate [Member] |  |  |
Loan balance, with no allowance recorded | 1,582,000 | 1,582,000 |
Recorded investment, with no allowance recorded | 1,582,000 | 1,582,000 |
Partial charge-off, with no allowance recorded | 0 | 0 |
Average investment in impaired loans, with no allowance recorded | 791,000 | 316,000 |
Interest income recognized, with no allowance recorded | 0 | 32,000 |
Loan balance, with allowance recorded | 280,000 | 280,000 |
Recorded investment, with allowance recorded | 288,000 | 288,000 |
Partial charge-off, with allowance recorded | 0 | 0 |
Impaired Financing Receivable, Related Allowance | 20,000 | 20,000 |
Average investment in impaired loans, with allowance recorded | 288,000 | 288,000 |
Interest income recognized, with allowance recorded | 0 | 0 |
Allowance for loan losses | 20,000 | 20,000 | 0
Commercial Portfolio Segment [Member] |  |  |
Allowance for loan losses | 0 | 0 | $ 0
Commercial Portfolio Segment [Member] | Other [Member] |  |  |
Loan balance, with no allowance recorded | 155,000 | 155,000 |
Recorded investment, with no allowance recorded | 155,000 | 155,000 |
Partial charge-off, with no allowance recorded | 0 | 0 |
Average investment in impaired loans, with no allowance recorded | 478,000 | 259,000 |
Interest income recognized, with no allowance recorded | $ 27,000 | $ 27,000 |

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