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Note 7 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Customer A [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]    
Note 7 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]    
Receivables Percentage by Major Customer 40.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= pdfs_CustomerAMember
51.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= pdfs_CustomerAMember
Customer C [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]    
Note 7 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]    
Receivables Percentage by Major Customer 27.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= pdfs_CustomerCMember
21.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= pdfs_CustomerCMember
Customer Concentration Risk [Member]    
Note 7 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]    
Receivables Percentage by Major Customer 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
 
Accounts Receivable [Member]    
Note 7 - Customer and Geographic Information (Details) - Receivables Percentage by Major Customers [Line Items]    
Receivables Percentage by Major Customer 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember