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Note 18 - Fair Value of Financial Instruments - Assets and Liabilities Carried at Fair Value on a Non-recurring Basis, and the Method Used to Determine Their Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value | $ 16,027 | $ 15,501
Impaired Loans [Member] |  |
Fair Value | 16,027 | 14,968
Other Real Estate Owned [Member] |  |
Fair Value |  | 533
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value |  |
Fair Value, Inputs, Level 1 [Member] | Impaired Loans [Member] |  |
Fair Value |  |
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member] |  |
Fair Value |  |
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value |  |
Fair Value, Inputs, Level 2 [Member] | Impaired Loans [Member] |  |
Fair Value |  |
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member] |  |
Fair Value |  |
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value | 16,027 | 15,501
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Fair Value | 16,027 | 14,968
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] |  |
Fair Value |  | $ 533

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- 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

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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: |
Period Type: |

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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
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |