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Note 19 - Fair Value Measurements (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financial and Nonfinancial Liabilities, Fair Value Disclosure | $ 0 |  |
Foreclosed Real Estate [Member] |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount | 284,000 | $ 419,000 | $ 263,000
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount | $ 22,000 | $ 231,000 | $ 39,000
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs | 40.00% | 20.00% |
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs | 66.00% | 62.00% |
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Weighted Average [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs | 47.00% | 39.00% |
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs | 38.00% |  |
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs |  | 10.00% |
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs |  | 79.00% |
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] | Weighted Average [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs |  | 51.00% |

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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of write-down or reserve recognized in the income statement on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 5)) -URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024 + Details
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