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Note 8 - Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Note 8 - Income Taxes (Details) [Line Items]        
Income (Loss) from Continuing Operations before Income Taxes, Domestic $ 26,200,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 29,600,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 17,700,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic  
Income (Loss) from Continuing Operations before Income Taxes, Foreign 1,800,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 1,700,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 1,200,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate      
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     (19,900,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount  
Deferred Tax Assets, Valuation Allowance 5,433,000us-gaap_DeferredTaxAssetsValuationAllowance 5,087,000us-gaap_DeferredTaxAssetsValuationAllowance    
Deferred Tax Assets, Net 11,344,000us-gaap_DeferredTaxAssetsLiabilitiesNet 14,521,000us-gaap_DeferredTaxAssetsLiabilitiesNet    
Deferred Tax Assets, Net, Current 3,300,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 5,900,000us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent    
Deferred Tax Assets, Net, Noncurrent 8,000,000us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 8,600,000us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 467,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued 466,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued    
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense 1,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 39,000us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense (16,000)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense  
Unrecognized Tax Benefits 10,428,000us-gaap_UnrecognizedTaxBenefits 10,216,000us-gaap_UnrecognizedTaxBenefits 9,553,000us-gaap_UnrecognizedTaxBenefits 9,644,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 6,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 6,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Unrecognized Tax Benefits In Long Term Liabilities 2,600,000pdfs_UnrecognizedTaxBenefitsInLongTermLiabilities      
Unrecognized Tax Benefits In Deferred Tax Assets 8,300,000pdfs_UnrecognizedTaxBenefitsInDeferredTaxAssets      
Unrecognized Tax Benefits In Deferred Tax Asset Subject To Full Valuation Allowance 4,100,000pdfs_UnrecognizedTaxBenefitsInDeferredTaxAssetSubjectToFullValuationAllowance      
Undistributed Earnings of Foreign Subsidiaries 4,800,000us-gaap_UndistributedEarningsOfForeignSubsidiaries      
State and Local Jurisdiction [Member] | California Franchise Tax Board [Member]        
Note 8 - Income Taxes (Details) [Line Items]        
Operating Loss Carryforwards 6,200,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_CaliforniaFranchiseTaxBoardMember		      
Deferred Tax Assets, Valuation Allowance 5,400,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_CaliforniaFranchiseTaxBoardMember		 5,100,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_CaliforniaFranchiseTaxBoardMember		    
State and Local Jurisdiction [Member]        
Note 8 - Income Taxes (Details) [Line Items]        
Tax Credit Carryforward, Amount 12,400,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Unrecorded Windfall Deductions 66,000pdfs_UnrecordedWindfallDeductions
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Excluded Windfall Deductions   78,000pdfs_ExcludedWindfallDeductions
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
Domestic Tax Authority [Member]        
Note 8 - Income Taxes (Details) [Line Items]        
Tax Credit Carryforward, Amount 9,200,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
Unrecorded Windfall Deductions 5,100,000pdfs_UnrecordedWindfallDeductions
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
Excluded Windfall Deductions   $ 4,900,000pdfs_ExcludedWindfallDeductions
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember