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Note 6 - Income Taxes (Details) - Reconciliation of Income Tax Expense By Applying The Statutory Federal Rate (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Income Tax Expense By Applying The Statutory Federal Rate [Abstract]
Income taxes at statutory rate	$ 18,807us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 15,497us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 14,856us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State and local income taxes, net of federal tax benefit	674us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	587us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	719us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Research and development tax credits	(371)us-gaap_IncomeTaxReconciliationTaxCreditsResearch	(740)us-gaap_IncomeTaxReconciliationTaxCreditsResearch
Domestic production activities deduction	(1,324)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(952)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities	(980)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities
Lower foreign taxes differential	(583)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(612)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(528)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Uncertain tax positions	53us-gaap_IncomeTaxReconciliationTaxContingencies	94us-gaap_IncomeTaxReconciliationTaxContingencies	(236)us-gaap_IncomeTaxReconciliationTaxContingencies
Valuation allowance	174us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	162us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other	163us-gaap_IncomeTaxReconciliationOtherReconcilingItems	137us-gaap_IncomeTaxReconciliationOtherReconcilingItems	413us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax expense	$ 17,593us-gaap_IncomeTaxExpenseBenefit	$ 14,173us-gaap_IncomeTaxExpenseBenefit	$ 14,244us-gaap_IncomeTaxExpenseBenefit

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

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Amount 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 tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments.

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