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Nature of Business and Significant Accounting Policies (Long-lived assets) (Details) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2014
sqft
Dec. 31, 2014
sqft
Dec. 31, 2013
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2013
Mar. 31, 2012
sqft
Sep. 30, 2011
sqft
Impaired Long-Lived Assets Held and Used [Line Items]                
Gain (Loss) on Disposition of Business   $ 1,200,000us-gaap_GainLossOnSaleOfBusiness            
Other Asset Impairment Charges   700,000us-gaap_OtherAssetImpairmentCharges            
Asset Impairment Charges 600,000us-gaap_AssetImpairmentCharges 2,086,000us-gaap_AssetImpairmentCharges 0us-gaap_AssetImpairmentCharges          
Net Rentable Area 9,000us-gaap_NetRentableArea 9,000us-gaap_NetRentableArea         6,700us-gaap_NetRentableArea 47,000us-gaap_NetRentableArea
Segment, Discontinued Operations [Member]                
Impaired Long-Lived Assets Held and Used [Line Items]                
Asset Impairment Charges       600,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_SegmentDiscontinuedOperationsMember
700,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_SegmentDiscontinuedOperationsMember
     
Marketing Services [Member]                
Impaired Long-Lived Assets Held and Used [Line Items]                
Asset Impairment Charges     $ 600,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= pdii_MarketingServicesMember
    $ 100,000us-gaap_AssetImpairmentCharges
/ us-gaap_StatementBusinessSegmentsAxis
= pdii_MarketingServicesMember