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8. Subordinated Convertible Debentures Payable (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Subordinated convertible debentures payable $ 8,552,000us-gaap_ConvertibleSubordinatedDebt $ 9,059,000us-gaap_ConvertibleSubordinatedDebt
6 and 1/2 %, due June 1991    
Subordinated convertible debentures payable 527,000us-gaap_ConvertibleSubordinatedDebt
/ us-gaap_SubordinatedBorrowingAxis
= PGAI_SubordinatedDebtAMember
1,034,000us-gaap_ConvertibleSubordinatedDebt
/ us-gaap_SubordinatedBorrowingAxis
= PGAI_SubordinatedDebtAMember
6%, due May 1992    
Subordinated convertible debentures payable $ 8,025,000us-gaap_ConvertibleSubordinatedDebt
/ us-gaap_SubordinatedBorrowingAxis
= PGAI_SubordinatedDebtBMember
$ 8,025,000us-gaap_ConvertibleSubordinatedDebt
/ us-gaap_SubordinatedBorrowingAxis
= PGAI_SubordinatedDebtBMember