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Investments in Marketable Securities (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Investment	Jun. 30, 2011	Jun. 30, 2012 Investment	Jun. 30, 2011	Dec. 31, 2011 Investment
Investments in Marketable Securities (Textual) [Abstract]
Gains or losses realized on the sale of marketable securities	$ 0	$ 0	$ 0	$ 0
Number of investments in an unrealized loss position	0		0		2

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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