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Cost-Basis Investment (Details Textual) (USD $)			1 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Apr. 25, 2012 Clearsign Combustion Corporation [Member]	Apr. 20, 2011 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					3,539
Equity Method Investment Value Retained After Dividend Distribution					17,390
Available-for-sale Securities, Gross Unrealized Gains	$ 25,461	$ 12,787			$ 9,485

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- Definition

Number of common shares for which dividend has been declared.

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- Definition

Common stock dividend rate percentage.

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- Definition

Number of rounding shares issued for common stock dividend.

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- Definition

Value of equity method investment measured cost basis.

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- Definition

Number of shares retained in equity method investment after dividend distribution.

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- Definition

Per share value of shares acquired in equity method investment.

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Number of shares acquired in equity method investment.

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Equity method investments shares acquired after stock split.

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Amount retained in equity method investment after dividend distribution.

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- Definition

Number of shares issuable for one share of equity method investee.

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- Definition

Value of stock issued in public offerings.

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- Definition

This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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- Definition

Number of shares of common stock issued as dividends during the period. Excludes stock splits.

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- Definition

This element represents the aggregate cost of investments accounted for under the equity method of accounting.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

This item represents the amount of gain (loss) arising from the disposal of an equity method investment.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

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