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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, 2019 | Dec. 31, 2018
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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] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate 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 1 [Member] | Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Fair Value, Recurring [Member] |  |
Assets, fair value | 16,689 | 16,630
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] |  |
Assets, fair value |  |
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate 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 | 93,592 | 85,534
Fair Value, Inputs, Level 2 [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Recurring [Member] | Interest Rate Swap [Member] |  |
Assets, fair value | 237 | 101
Liabilities, fair value | (237) | (101)
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Assets, fair value | 228 | 228
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] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] |  |
Assets, fair value | 1,206 |
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] |  |
Assets, fair value | 263 | 264
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Assets, fair value | 156 |
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Fair Value, Nonrecurring [Member] | Commercial and Industrial Portfolio Segment [Member] |  |
Assets, fair value | 1,898 |
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 |  |
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Assets, 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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