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Note 13 - Condensed Financial Statements of Parent Company (Details) - Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash Flows from Operating Expenses |  |  |
Net income | $ 16,914 us-gaap_NetIncomeLoss | $ 17,790 us-gaap_NetIncomeLoss | $ 17,747 us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Amortization of premiums and accretion of discounts, net | 138 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments | 171 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments | 224 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments
Depreciation expense | 732 us-gaap_Depreciation | 726 us-gaap_Depreciation | 764 us-gaap_Depreciation
(Gains) Losses on disposal of fixed assets | 94 us-gaap_GainLossOnDispositionOfAssets1 | (11)us-gaap_GainLossOnDispositionOfAssets1 | (3)us-gaap_GainLossOnDispositionOfAssets1
Net change in other assets | (574)us-gaap_IncreaseDecreaseInOtherOperatingAssets | 1,760 us-gaap_IncreaseDecreaseInOtherOperatingAssets | (8)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Net change in other liabilities | (428)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 83 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | (175)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Losses on securities | (2)us-gaap_GainLossOnSaleOfSecuritiesNet | 46 us-gaap_GainLossOnSaleOfSecuritiesNet | (60)us-gaap_GainLossOnSaleOfSecuritiesNet
Cash Flows from Investing Activities |  |  |
Net Change in interest-bearing deposits | (4,482)us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks | (781)us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks | 1,634 us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks
Purchases of securities available for sale | (33,905)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (83,996)us-gaap_PaymentsToAcquireAvailableForSaleSecurities | (171,577)us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Purchases of securities held to maturity | (6,381)us-gaap_PaymentsToAcquireHeldToMaturitySecurities | (13,484)us-gaap_PaymentsToAcquireHeldToMaturitySecurities | (47,803)us-gaap_PaymentsToAcquireHeldToMaturitySecurities
Maturities and calls of securities available for sale | 11,088 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 63,886 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities | 151,175 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities
Proceeds from sale of premises and equipment | 453 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 11 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment |
Cash Flows from Financing Activities |  |  |
Cash dividends paid | (7,853)us-gaap_PaymentsOfDividends | (7,781)us-gaap_PaymentsOfDividends | (7,639)us-gaap_PaymentsOfDividends
Exercise of stock options | 58 us-gaap_ProceedsFromStockOptionsExercised |  | 119 us-gaap_ProceedsFromStockOptionsExercised
Net change in cash | (389)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (1,500)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 2,886 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Parent Company [Member] |  |  |
Cash Flows from Operating Expenses |  |  |
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
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
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
Amortization of premiums and accretion of discounts, net | 1 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1 us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Depreciation expense | 9 us-gaap_Depreciation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 17 us-gaap_Depreciation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 12 us-gaap_Depreciation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
(Gains) Losses on disposal of fixed assets | 94 us-gaap_GainLossOnDispositionOfAssets1 / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Net change in refundable income taxes due from subsidiaries | 96 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 77 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 77 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in other assets | (63)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3 us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (199)us-gaap_IncreaseDecreaseInOtherOperatingAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in other liabilities | (33)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 20 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (124)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Losses on securities |  | 94 us-gaap_GainLossOnSaleOfSecuritiesNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net cash provided by operating activities | 7,300 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,456 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,002 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows from Investing Activities |  |  |
Net Change in interest-bearing deposits | 213 us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (2)us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (124)us-gaap_ProceedsFromPaymentsForInInterestBearingDepositsInBanks / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of securities available for sale |  | (612)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (691)us-gaap_PaymentsToAcquireAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Purchases of securities held to maturity | (453)us-gaap_PaymentsToAcquireHeldToMaturitySecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Maturities and calls of securities available for sale | 455 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 945 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,352 us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Proceeds from sale of premises and equipment | 263 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Net cash provided by investing activities | 478 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 331 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 537 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash Flows from Financing Activities |  |  |
Cash dividends paid | (7,853)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,781)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,639)us-gaap_PaymentsOfDividends / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Exercise of stock options | 58 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 119 us-gaap_ProceedsFromStockOptionsExercised / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net cash used in financing activities | (7,795)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,781)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | (7,520)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Net change in cash | 17 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 6 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 19 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash due from subsidiaries at beginning of year | 27 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 21 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 2 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Cash due from subsidiaries at end of year | $ 10 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 27 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 21 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450594&loc=d3e33268-110906 + Details
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- Definition The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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