Investments (Narrative) (Details) (Oxane Materials, Inc. [Member], USD $)	1 Months Ended	3 Months Ended
	May 21, 2008	Dec. 31, 2008	Dec. 31, 2012	Dec. 31, 2011
Oxane Materials, Inc. [Member]
Investment [Line Items]
Contribution in exchange for warrants to purchase common stock	$ 2,000,000
Convertible promissory note	500,000
Convertible promissory note accrued interest rate	6.00%
Shares received upon conversion of promissory note		630,371
Investments at cost			$ 2,500,000	$ 2,500,000