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Commitments and Contingencies (Details Textual) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2010
Jul. 19, 2012
Jun. 30, 2007
Commitments and Contingencies (Textual) [Abstract]          
Company made payments to Lower Willamette Group as interim settlement $ 0 $ 0     $ 175,000
Amount of expenses expected to spend to complete work specified in Work Plans 2,000,000 2,000,000      
Total stand by letters of credit 3,200,000 3,200,000      
Accrued Liabilities Payment Related to Settlement of Litigation       12,500,000  
Payments for Legal Settlements 200,000 400,000 200,000    
Plaintiffs' attorney's fees       $ 750,000