Common Stock Investment (Details Textual) (USD $)	6 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2013	Sep. 30, 2013	Dec. 31, 2012
Investment Percentage in Common Stock and Preferred Stock		0.77%	1.00%
Additional Investment	$ 14,000
Unrealized Gain (Loss) on Investments		2,400,000
Common Stock [Member]
Cost Method Investments		2,701,000	0
Preferred Stock [Member]
Cost Method Investments		0	2,687,000
Mevion S250 [Member]
Cost Method Investments	$ 55,000,000