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Note 11 - Fair Value of Financial Instruments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Impaired Loans [Member] |  |
Assets, fair value, nonrecurring | $ 6,090,000 | $ 6,952,000
Other Real Estate [Member] |  |
Assets, fair value, nonrecurring | 1,857,000 | 2,505,000
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |
Assets, fair value, nonrecurring | 6,090,000 | 6,952,000
Fair Value, Inputs, Level 3 [Member] | Other Real Estate [Member] |  |
Assets, fair value, nonrecurring | 1,857,000 | 2,505,000
Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 337,710,000 | 323,658,000
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | 337,134,000 | 323,082,000
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value, recurring | 576,000 | 576,000
US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 330,742 | 319,097
US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets, fair value, recurring |  |
US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | 330,742 | 319,097
US Government Agencies Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value, recurring |  |
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 4,904,000 | 4,561,000
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | 4,328,000 | 3,985,000
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Assets, fair value, recurring | 576,000 | $ 576,000
Corporate Debt Securities [Member] | Available-for-sale Securities [Member] |  |
Assets, fair value, recurring | 2,064,000 |
Corporate Debt Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets, fair value, recurring | $ 2,064,000 |

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
Name: | us-gaap_AssetsFairValueDisclosureRecurring
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: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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- Details
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