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Note 10 - Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Operating Leases, Rent Expense, Net | $ 0.5 | $ 0.5 | $ 1.0 | $ 1.2
Operating Leases Minimum Sublease Rental Income |  |  | $ 0.1 |

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- Definition No authoritative reference available. + References No definition available. + Details
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Namespace Prefix: | pdfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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Balance Type: | debit
Period Type: | duration