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Note 8 - Income Taxes (Details) - Income Tax Reconciliation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Reconciliation [Abstract]
Federal statutory tax provision	$ 9,786us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 10,958us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 6,609us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State tax provision (benefit)	56us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	581us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	(925)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Stock compensation expense	540us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	393us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	644us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Tax credits	(3,924)us-gaap_IncomeTaxReconciliationTaxCredits	(5,424)us-gaap_IncomeTaxReconciliationTaxCredits	(722)us-gaap_IncomeTaxReconciliationTaxCredits
Foreign tax, net	3,170us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	3,884us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	906us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Change in valuation allowance			(25,223)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other	(131)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(12)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	382us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Tax provision (benefit)	$ 9,497us-gaap_IncomeTaxExpenseBenefit	$ 10,380us-gaap_IncomeTaxExpenseBenefit	$ (18,329)us-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 increase (decrease) in the valuation allowance for deferred tax assets.

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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 foreign income tax expense (benefit).

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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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