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Note 8 - Income Taxes (Details) - Income Tax Expense (Benefit) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S.
Current	$ 3,032us-gaap_CurrentFederalTaxExpenseBenefit	$ 719us-gaap_CurrentFederalTaxExpenseBenefit	$ 271us-gaap_CurrentFederalTaxExpenseBenefit
Deferred	2,882	5,432	(19,863)
Foreign
Current	476us-gaap_CurrentForeignTaxExpenseBenefit	291us-gaap_CurrentForeignTaxExpenseBenefit	512us-gaap_CurrentForeignTaxExpenseBenefit
Withholding	3,103pdfs_ForeignIncomeTaxWithholding	3,830pdfs_ForeignIncomeTaxWithholding	948pdfs_ForeignIncomeTaxWithholding
Deferred	4	108	(197)
Total provision (benefit)	$ 9,497us-gaap_IncomeTaxExpenseBenefit	$ 10,380us-gaap_IncomeTaxExpenseBenefit	$ (18,329)us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.