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Note 13 - Condensed Financial Statements of Parent Company (Details) - Condensed Balance Sheets (Parentheticals) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securities held to maturity, fair value | $ 167,703 us-gaap_HeldToMaturitySecuritiesFairValue | $ 159,337 us-gaap_HeldToMaturitySecuritiesFairValue
Parent Company [Member] |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |
Securities held to maturity, fair value | $ 450 us-gaap_HeldToMaturitySecuritiesFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 0 us-gaap_HeldToMaturitySecuritiesFairValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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Balance Type: | na
Period Type: | duration

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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + Details
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Balance Type: | debit
Period Type: | instant

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