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Note 7 - Restructuring (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Note 7 - Restructuring (Details) [Line Items]
Restructuring Charges	$ 57,000us-gaap_RestructuringCharges	$ 197,000us-gaap_RestructuringCharges	$ 1,889,000us-gaap_RestructuringCharges
Restructuring Reserve	0us-gaap_RestructuringReserve
Employee Severance [Member] | October 2012 Plan [Member]
Note 7 - Restructuring (Details) [Line Items]
Restructuring Charges	57,000us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember	249,000us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember	1,733,000us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember
Restructuring Reserve		13,000us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember	885,000us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember
Restructuring and Related Cost, Cost Incurred to Date	2,100,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1 / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember
October 2012 Plan [Member]
Note 7 - Restructuring (Details) [Line Items]
Restructuring Charges	57,000us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember	300,000us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember	1,806,000us-gaap_RestructuringCharges / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember
Restructuring Reserve		13,000us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember	896,000us-gaap_RestructuringReserve / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember
Restructuring and Related Cost, Cost Incurred to Date	$ 2,200,000us-gaap_RestructuringAndRelatedCostCostIncurredToDate1 / us-gaap_RestructuringPlanAxis = pdfs_October2012PlanMember

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Amount of costs incurred to date for the specified restructuring cost.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 1

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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