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Note 14 - Commitments and Off-balance-sheet Risk (Details) - Instruments Carried at Fair Values (Standby Letters of Credit [Member], USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Standby Letters of Credit [Member] |  |
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Standby letters of credit | $ 35,461,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember | $ 19,670,000 us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember
Standby letters of credit | $ 150,000 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember | $ 148,000 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_StandbyLettersOfCreditMember

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- Details
Name: | us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant