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Note 2 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial and Industrial Portfolio Segment [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 1 [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Assets, fair value |  |
Liabilities, fair value |  |
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Assets, fair value | 16,016 | 16,736
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial and Industrial Portfolio Segment [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] |  |
Assets, fair value | 96,175 | 88,582
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Assets, fair value | 985 | 465
Liabilities, fair value | (985) | (465)
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Assets, fair value | 459 | 1,644
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial and Industrial Portfolio Segment [Member] |  |
Assets, fair value | 777 | 4,559
Fair Value, Inputs, Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Recurring [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Assets, fair value |  |
Liabilities, fair value |  |

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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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- 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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