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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, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Impaired loans, unpaid principal balance | $ 1,699 | $ 3,123 | $ 3,546
Impaired loans, recorded investment with no allowance | 1,016 | 2,513 | 2,802
Impaired loans, recorded investment with allowance | 550 | 494 | 634
Impaired loans, total recorded investment | 1,566 | 3,007 | 3,436
Impaired loans, related allowance | 74 | 107 | 243
Impaired loans, average recorded investment | 2,056 | 3,634 | 3,455
Impaired loans, interest income recognized | 5 | 54 | 85
Real Estate 1 [Member] | Construction and Land Development [Member] |  |  |
Impaired loans, unpaid principal balance | 403 | 343 | 336
Impaired loans, recorded investment with no allowance |  |  |
Impaired loans, recorded investment with allowance | 376 | 343 | 327
Impaired loans, total recorded investment | 376 | 343 | 327
Impaired loans, related allowance | 31 | 87 | 71
Impaired loans, average recorded investment | 368 | 900 | 758
Impaired loans, interest income recognized | 1 | 12 | 12
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] |  |  |
Impaired loans, unpaid principal balance | 781 | 511 | 720
Impaired loans, recorded investment with no allowance | 543 | 287 | 356
Impaired loans, recorded investment with allowance | 147 | 151 | 307
Impaired loans, total recorded investment | 690 | 438 | 663
Impaired loans, related allowance | 16 | 20 | 172
Impaired loans, average recorded investment | 800 | 1,172 | 966
Impaired loans, interest income recognized | 1 | 5 | 22
Real Estate 1 [Member] | Other Real Estate Loans [Member] |  |  |
Impaired loans, unpaid principal balance | 515 | 2,069 | 2,290
Impaired loans, recorded investment with no allowance | 473 | 2,029 | 2,249
Impaired loans, recorded investment with allowance | 27 |  |
Impaired loans, total recorded investment | 500 | 2,029 | 2,249
Impaired loans, related allowance | 27 |  |
Impaired loans, average recorded investment | 858 | 1,433 | 1,585
Impaired loans, interest income recognized | 3 | 37 | 51
Commercial and Industrial Loans [Member] |  |  |
Impaired loans, unpaid principal balance |  | 200 | 200
Impaired loans, recorded investment with no allowance |  | 197 | 197
Impaired loans, recorded investment with allowance |  |  |
Impaired loans, total recorded investment |  | 197 | 197
Impaired loans, related allowance |  |  |
Impaired loans, average recorded investment | 30 | 129 | 146
Impaired loans, interest income recognized |  |  |

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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=118936363&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=118936363&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=118936363&loc=d3e5212-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 + Details
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