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15. Fair Value of Financial Instruments (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Receivables $ 332,000us-gaap_DueFromRelatedPartiesCurrent $ 440,000us-gaap_DueFromRelatedPartiesCurrent
Carrying amount    
Cash and Restricted Cash 6,000PGAI_CashAndRestrictedCash
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
6,000PGAI_CashAndRestrictedCash
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Receivables 332,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
440,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Accounts Payable 6,000us-gaap_AccountsPayableCurrentAndNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
  
Debt 11,750,000us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
12,257,000us-gaap_LongTermDebt
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair value    
Cash and Restricted Cash 6,000PGAI_CashAndRestrictedCash
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
6,000PGAI_CashAndRestrictedCash
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Receivables 332,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
440,000us-gaap_DueFromRelatedPartiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Accounts Payable 6,000us-gaap_AccountsPayableCurrentAndNoncurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
  
Debt