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Note 6 - Fair Value Measurements - Fair Value Quantitative Information (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Estimated Fair Value |  | $ 3,686 | $ 4,539
Fair Value, Inputs, Level 3 [Member] |  |  |
Estimated Fair Value |  | 3,686 | 4,539
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Evaluation of Collateral [Member] |  |  |
Estimated Fair Value |  | $ 1,973 | $ 535
Unobservable Inputs, Rate | [1] |  |
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Evaluation of Collateral [Member] | Minimum [Member] |  |  |
Unobservable Inputs, Rate |  | 6.00% |
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Evaluation of Collateral [Member] | Maximum [Member] |  |  |
Unobservable Inputs, Rate |  | 8.00% |
Fair Value, Inputs, Level 3 [Member] | Impaired Loan [Member] | Evaluation of Collateral [Member] | Weighted Average [Member] |  |  |
Unobservable Inputs, Rate |  | (7.00%) |
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Appraisal Valuation [Member] |  |  |
Estimated Fair Value |  | $ 1,713 | $ 4,004
Unobservable Inputs, Rate |  |  |
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Appraisal Valuation [Member] | Minimum [Member] |  |  |
Unobservable Inputs, Rate |  | 6.00% | 6.00%
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Appraisal Valuation [Member] | Maximum [Member] |  |  |
Unobservable Inputs, Rate |  | 8.00% | 8.00%
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Appraisal Valuation [Member] | Weighted Average [Member] |  |  |
Unobservable Inputs, Rate |  | 7.00% | (7.00%)
[1] | Not Meaningful.

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- Definition Percentage of estimation of value used as an input to measure fair value. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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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