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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. 24, 2012
Apr. 25, 2012
Apr. 20, 2011
Sep. 30, 2012
Dec. 31, 2013
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