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Note 5 - Income Taxes (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Increase (Decrease) in Income Taxes $ 500,000us-gaap_IncreaseDecreaseInIncomeTaxes    
Income Tax Expense (Benefit) 3,553,000us-gaap_IncomeTaxExpenseBenefit 3,039,000us-gaap_IncomeTaxExpenseBenefit  
Effective Income Tax Rate Reconciliation, Percent 37.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Unrecognized Tax Benefits 10,300,000us-gaap_UnrecognizedTaxBenefits   10,400,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 6,100,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate   6,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
Unrecognized Tax Benefits In Long Term Liabilities 2,400,000pdfs_UnrecognizedTaxBenefitsInLongTermLiabilities    
Unrecognized Tax Benefits In Deferred Tax Assets 8,400,000pdfs_UnrecognizedTaxBenefitsInDeferredTaxAssets    
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance $ 4,200,000pdfs_UnrecognizedTaxBenefitsInDeferredTaxAssetSubjectToFullValuationAllowance