10. Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax asset:
Net operating loss carryover	$ 23,127	$ 20,653
Adjustments to reduce land to net realizable value	12us-gaap_DeferredTaxAssetsOther	12us-gaap_DeferredTaxAssetsOther
Expenses capitalized under IRC 263(a)	56	56
Environmental liability	24PGAI_EnvironmentalLiability	27PGAI_EnvironmentalLiability
Valuation allowance	(23,047)	(20,576)
Total tax asset	172us-gaap_DeferredTaxAssetsNet	172us-gaap_DeferredTaxAssetsNet
Deferred tax liability:
Basis difference of land and improvement inventories	172us-gaap_DeferredTaxLiabilitiesOther	172us-gaap_DeferredTaxLiabilitiesOther
Net deferred tax asset

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