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Investment in ClearSign (Details Textual) (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Apr. 25, 2012
Clearsign Combustion Corporation [Member]
Apr. 20, 2011
Clearsign Combustion Corporation [Member]
Jun. 30, 2012
Clearsign Combustion Corporation [Member]
Jun. 30, 2012
Clearsign Combustion Corporation [Member]
Apr. 24, 2012
Clearsign Combustion Corporation [Member]
Equity Method Investments Shares Acquired       363,636      
Equity Method Investment, Aggregate Cost       $ 1,000,000      
Equity Method Investments Per Share Value Of Shares Acquired       $ 2.75      
Stock Issued During Period, Value, Private Offering Issues       3,000,000      
Stockholders' Equity Note, Stock Split, Conversion Ratio           1.25  
Equity Method Investments Shares Acquired After Stock Split         454,545 454,545  
Equity Method Investment, Ownership Percentage         20.00% 20.00%  
Sale of Stock, Number of Shares Issued in Transaction     3,000,000        
Sale of Stock, Price Per Share     $ 4        
Common Stock Dividend Declared             450,000
Common Stock Dividend Rate Percentage             $ 0.05513475
Shares Issuable For One Share Of Equity Method Investee             18,137
Common Stock Dividends, Shares         450,952    
Common Stock Dividend Rounding Shares 952            
Equity Method Investment, Realized Gain (Loss) on Disposal           811,713  
Equity Method Investment Measured Cost Basis     1,803,808        
Equity Method Investment Shares Retained After Dividend Distribution         3,593 24,361  
Available-for-sale Securities, Gross Unrealized Gains $ 27,077 $ 12,787     $ 16,456 $ 16,456