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Note 12 - Income Taxes (Details) - Reconciliation of the Statutory Federal Income Tax Rate to the Company's Effective Income Tax Rate	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of the Statutory Federal Income Tax Rate to the Company's Effective Income Tax Rate [Abstract]
Statutory federal income tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase (decrease) due to
State income taxes, net of federal income tax benefit	5.33%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	5.26%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	5.22%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Tax exempt interest and dividend income	(2.28%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome	(2.17%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome	(2.46%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Stock-based compensation expense	0.04%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.06%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.08%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Other	(1.02%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.56%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments	(0.66%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rates	37.07%us-gaap_EffectiveIncomeTaxRateContinuingOperations	37.59%us-gaap_EffectiveIncomeTaxRateContinuingOperations	37.18%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

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-Topic 235

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to equity-based compensation costs.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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