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Note 13 - Condensed Financial Statements of Parent Company (Details) - Condensed Statements of Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Income |  |  |
Interest on securities – taxable | $ 6,798 us-gaap_InterestIncomeSecuritiesTaxable | $ 6,585 us-gaap_InterestIncomeSecuritiesTaxable | $ 6,460 us-gaap_InterestIncomeSecuritiesTaxable
Interest on securities – nontaxable | 5,826 us-gaap_InterestIncomeSecuritiesTaxExempt | 6,388 us-gaap_InterestIncomeSecuritiesTaxExempt | 6,463 us-gaap_InterestIncomeSecuritiesTaxExempt
Realized securities losses, net | 2 us-gaap_GainLossOnSaleOfSecuritiesNet | (46)us-gaap_GainLossOnSaleOfSecuritiesNet | 60 us-gaap_GainLossOnSaleOfSecuritiesNet
Other income | 868 us-gaap_NoninterestIncomeOtherOperatingIncome | 997 us-gaap_NoninterestIncomeOtherOperatingIncome | 669 us-gaap_NoninterestIncomeOtherOperatingIncome
Expenses |  |  |
Income before income tax benefit and equity in undistributed net income of subsidiaries | 22,092 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 23,107 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 22,992 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Applicable income tax benefit | (5,178)us-gaap_IncomeTaxExpenseBenefit | (5,317)us-gaap_IncomeTaxExpenseBenefit | (5,245)us-gaap_IncomeTaxExpenseBenefit
Net income | 16,914 us-gaap_NetIncomeLoss | 17,790 us-gaap_NetIncomeLoss | 17,747 us-gaap_NetIncomeLoss
Parent Company [Member] |  |  |
Income |  |  |
Dividends from subsidiaries | 7,853 us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,882 us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,639 us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest on securities – taxable | 2 us-gaap_InterestIncomeSecuritiesTaxable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2 us-gaap_InterestIncomeSecuritiesTaxable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5 us-gaap_InterestIncomeSecuritiesTaxable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Interest on securities – nontaxable | 1 us-gaap_InterestIncomeSecuritiesTaxExempt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 19 us-gaap_InterestIncomeSecuritiesTaxExempt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 33 us-gaap_InterestIncomeSecuritiesTaxExempt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Realized securities losses, net |  | (94)us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other income | 1,250 us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,219 us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,213 us-gaap_NoninterestIncomeOtherOperatingIncome / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
| 9,106 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 9,028 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 8,890 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Expenses |  |  |
Other expenses | 2,046 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,943 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,791 us-gaap_OtherExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before income tax benefit and equity in undistributed net income of subsidiaries | 7,060 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,085 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,099 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Applicable income tax benefit | 136 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 160 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 136 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Income before equity in undistributed net income of subsidiaries | 7,196 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,245 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,235 us-gaap_ProfitLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Equity in undistributed net income of subsidiaries | 9,718 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,545 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 10,512 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net income | $ 16,914 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 17,790 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 17,747 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition Amount of operating dividend income on securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 9 + Details
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- Definition The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Subparagraph h -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Article 7 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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