Note 1 - Basis of Presentation (Detail) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2011
Net Income (Loss) Period Increase Decrease (in Dollars)	$ 44,000	$ 203,000
Earnings Per Share Period Increase Decrease (in Dollars per share)		$ 0.01

The amount of increase (decrease) in net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

No definition available.

Name:	pdfs_EarningsPerSharePeriodIncreaseDecrease
Namespace Prefix:	pdfs_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration