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Note 16 - Income Taxes (Details) - Reconciliation Between U.S. Federal Statutory Rate and Effective Rate	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation Between U.S. Federal Statutory Rate and Effective Rate [Abstract]
Statutory federal income tax rate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State tax expense, net of federal benefit	4.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	4.80%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	6.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent items, including nondeductible expenses	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.90%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
State investment tax credit	(0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	(0.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment	(0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsInvestment
Federal, state and foreign research and development credits	(0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	(0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	(1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Foreign rate differential	0.20%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.10%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	2.50%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Domestic production deduction	(1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	(2.40%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	(3.60%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities
Effective income tax rate	37.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations	36.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations	39.80%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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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 deduction for qualified production activity.

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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 statutory income tax expense (benefit) outside of the country of domicile.

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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 nondeductible expenses.

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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 investment tax credit.

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