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Cost-Basis Investment (Details Textual) (USD $)
 0 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended
Apr. 29, 2013
Apr. 25, 2012
Apr. 20, 2011
Sep. 30, 2012
Dec. 31, 2013
Apr. 24, 2012
Schedule of Investments [Line Items]            
Stockholders Equity Note, Stock Split, Conversion Ratio     1.25      
Equity Method Investments Shares Acquired After Stock Split     454,545      
Equity Method Investment, Ownership Percentage       20.00%    
Clearsign Combustion Corporation [Member]
            
Schedule of Investments [Line Items]            
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      
Sale of Stock, Number of Shares Issued in Transaction   3,000,000        
Sale of Stock, Price Per Share   $ 4.00        
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          
Available-for-sale Securities, Gross Realized Gains         $ 24,475