Cost-Basis Investment (Details Textual) (USD $)					1 Months Ended		3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Apr. 20, 2011	Apr. 25, 2012 Clearsign Combustion Corporation [Member]	Apr. 20, 2011 Clearsign Combustion Corporation [Member]	Mar. 31, 2013 Clearsign Combustion Corporation [Member]	Dec. 31, 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
Equity Method Investments Shares Acquired After Stock Split				454,545
Equity Method Investment, Ownership Percentage			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
Equity Method Investment Value Retained After Dividend Distribution							25,546
Available-for-sale Securities, Gross Unrealized Gains	$ 36,255	$ 25,461					$ 8,156