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Note 4 - Allowance for Loan Losses - Impaired Loans and Related Allowances (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Impaired loans, unpaid principal balance | $ 1,714 | $ 2,259 | $ 1,639
Impaired loans, recorded investment with no allowance | 1,299 | 1,588 | 1,020
Impaired loans, recorded investment with allowance | 223 | 587 | 439
Impaired loans, total recorded investment | 1,522 | 2,175 | 1,459
Impaired loans, related allowance | 11 | 129 | 33
Impaired loans, average recorded investment | 1,438 | 2,406 | 1,926
Impaired loans, interest income recognized | 1 | 10 | 5
Real Estate 1 [Member] | Construction and Land Development [Member] |  |  |
Impaired loans, unpaid principal balance | 439 | 412 | 401
Impaired loans, recorded investment with no allowance | 400 |  | 70
Impaired loans, recorded investment with allowance |  | 398 | 297
Impaired loans, total recorded investment | 400 | 398 | 367
Impaired loans, related allowance |  | 71 | 22
Impaired loans, average recorded investment | 367 | 326 | 369
Impaired loans, interest income recognized |  | 1 | 1
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] |  |  |
Impaired loans, unpaid principal balance | 770 | 1,055 | 729
Impaired loans, recorded investment with no allowance | 444 | 836 | 488
Impaired loans, recorded investment with allowance | 223 | 154 | 142
Impaired loans, total recorded investment | 667 | 990 | 630
Impaired loans, related allowance | 11 | 23 | 11
Impaired loans, average recorded investment | 613 | 661 | 769
Impaired loans, interest income recognized | 1 | 2 | 1
Real Estate 1 [Member] | Other Real Estate Loans [Member] |  |  |
Impaired loans, unpaid principal balance | 505 | 792 | 509
Impaired loans, recorded investment with no allowance | 455 | 752 | 462
Impaired loans, recorded investment with allowance |  | 35 |
Impaired loans, total recorded investment | 455 | 787 | 462
Impaired loans, related allowance |  | 35 |
Impaired loans, average recorded investment | 458 | 1,329 | 766
Impaired loans, interest income recognized |  | 7 | 3
Commercial and Industrial Loans [Member] |  |  |
Impaired loans, unpaid principal balance |  |  |
Impaired loans, recorded investment with no allowance |  |  |
Impaired loans, recorded investment with allowance |  |  |
Impaired loans, total recorded investment |  |  |
Impaired loans, related allowance |  |  |
Impaired loans, average recorded investment |  | 90 | 22
Impaired loans, interest income recognized |  |  |

X
- 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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