AGREEMENT WITH NEW YORK UNIVERSITY ON BEHALF OF NEW YORK UNIVERSITY MEDICAL CENTER (NYU) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
AGREEMENT WITH NEW YORK UNIVERSITY ON BEHALF OF NEW YORK UNIVERSITY MEDICAL CENTER (NYU) [Abstract]
Term of equipment agreement with NYC	7 years
Option to extend agreement term	3 years
Patient revenue derived from the NYC	$ 1,942,000	$ 2,029,000	$ 1,907,000
Extension of agreement (in years)	12 years
Cost of new equipment installed	3,742,000			3,742,000
Equipment financed term	7 years
Emergency removal cost		525,000
Insurance funds received above principal payments and emergency removal costs	930,000
Income statement items in relation to Hurricane Sandy which are included in the other income/expense [Abstract]
Insurance recovery income	3,265,000
Expenses related to hurricane
Damaged gamma knife equipment due to flooding	1,910,000
Costs related to disposal of gamma knife equipment	425,000
Total of income statements items included in expense and income section	2,335,000
Net gain on disposal	$ 930,000