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Note 4 - Allowance for Loan Losses - Impaired Loans and Related Allowances (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Impaired loans, unpaid principal balance | $ 7,149 | $ 1,699 | $ 1,639
Impaired loans, recorded investment with no allowance | 1,113 | 1,016 | 1,020
Impaired loans, recorded investment with allowance | 5,861 | 550 | 439
Impaired loans, total recorded investment | 6,974 | 1,566 | 1,459
Impaired loans, related allowance | 2,289 | 74 | 33
Impaired loans, average recorded investment | 2,882 | 2,056 | 1,926
Impaired loans, interest income recognized | 187 | 5 | 5
Real Estate 1 [Member] | Construction and Land Development [Member] |  |  |
Impaired loans, unpaid principal balance | 325 | 403 | 401
Impaired loans, recorded investment with no allowance | 283 | 0 | 70
Impaired loans, recorded investment with allowance | 0 | 376 | 297
Impaired loans, total recorded investment | 283 | 376 | 367
Impaired loans, related allowance | 0 | 31 | 22
Impaired loans, average recorded investment | 366 | 368 | 369
Impaired loans, interest income recognized | 0 | 1 | 1
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] |  |  |
Impaired loans, unpaid principal balance | 578 | 781 | 729
Impaired loans, recorded investment with no allowance | 469 | 543 | 488
Impaired loans, recorded investment with allowance | 0 | 147 | 142
Impaired loans, total recorded investment | 469 | 690 | 630
Impaired loans, related allowance | 0 | 16 | 11
Impaired loans, average recorded investment | 536 | 800 | 769
Impaired loans, interest income recognized | 1 | 1 | 1
Real Estate 1 [Member] | Other Real Estate Loans [Member] |  |  |
Impaired loans, unpaid principal balance | 4,698 | 515 | 509
Impaired loans, recorded investment with no allowance | 361 | 473 | 462
Impaired loans, recorded investment with allowance | 4,313 | 27 | 0
Impaired loans, total recorded investment | 4,674 | 500 | 462
Impaired loans, related allowance | 2,108 | 27 | 0
Impaired loans, average recorded investment | 1,974 | 858 | 766
Impaired loans, interest income recognized | 109 | 3 | 3
Commercial and Industrial Loans [Member] |  |  |
Impaired loans, unpaid principal balance | 1,548 | 0 | 0
Impaired loans, recorded investment with no allowance | 0 | 0 | 0
Impaired loans, recorded investment with allowance | 1,548 | 0 | 0
Impaired loans, total recorded investment | 1,548 | 0 | 0
Impaired loans, related allowance | 181 | 0 | 0
Impaired loans, average recorded investment | 6 | 30 | 22
Impaired loans, interest income recognized | $ 77 | $ 0 | $ 0

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524 + Details
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- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
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