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Note 19 - Fair Value Measurements (Details Textual) | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Number of Foreclosed Real Estate Properties | 0 |  |
Foreclosed Real Estate [Member] |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Write-down or Reserve, Amount | $ 0 | $ 284,000 | $ 419,000
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 | $ 0 | $ 22,000 | $ 231,000
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Minimum [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs | 10.00% | 0.00% |
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Maximum [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs | 66.00% | 66.00% |
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Weighted Average [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs | 27.00% | 24.00% |
Fair Value, Inputs, Level 3 [Member] | Foreclosed Real Estate [Member] |  |  |
Fair Value Inputs, Estimated Selling Costs |  | 38.00% |

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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=120402810&loc=d3e638233-123024 + Details
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