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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 | Sep. 30, 2017 | Dec. 31, 2016
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Fair Value, Inputs, Level 1 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Assets measured on a recurring basis |  |
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Residential Portfolio Segment [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 1 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured on a recurring basis |  |
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 2 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Assets measured on a recurring basis | 13,579 | 10,544
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Residential Portfolio Segment [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured on a recurring basis | 92,966 | 85,946
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Assets measured on a nonrecurring basis |  |
Fair Value, Inputs, Level 3 [Member] | US Government-sponsored Enterprises Debt Securities [Member] |  |
Assets measured on a recurring basis |  |
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Residential Portfolio Segment [Member] |  |
Assets measured on a nonrecurring basis | 94 |
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Owner Occupied [Member] |  |
Assets measured on a nonrecurring basis |  | 3,536
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Nonowner Occupied [Member] |  |
Assets measured on a nonrecurring basis | 2,602 | 1,985
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Assets measured on a nonrecurring basis | 754 |
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |
Assets measured on a nonrecurring basis |  | 298
Fair Value, Inputs, Level 3 [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Assets measured on a recurring basis |  |
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |
Assets measured on a nonrecurring basis |  | $ 754

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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- Details
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Data Type: | na
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- Details
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Data Type: | na
Balance Type: |
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