ACCOUNTING POLICIES (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013 Customers	Dec. 31, 2012 Customers	Dec. 31, 2011
Accounting Policies [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	$ 9,000,000
Number Of Customers	19	19
Interest Costs Capitalized	390,000	196,000
Property Subject to or Available for Operating Lease, Net, Total	79,828,000	80,884,000
Property Subject to or Available for Operating Lease, Accumulated Depreciation	44,630,000	38,515,000
Cost Method Investments	2,701,000	2,687,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	576,000	588,000	570,000
Foreign Currency Transaction Gain, before Tax	1,174,000	132,000	27,000
Certificates of Deposit [Member]
Accounting Policies [Line Items]
Line of Credit Facility, Maximum Amount Outstanding During Period	$ 9,000,000	$ 9,000,000
Investment Interest Rate	10.00%	45.00%
Investment Maturity Date	Aug. 31, 2014	Aug. 31, 2013
Mevion Medical Systems Inc [Member]
Accounting Policies [Line Items]
Cost Method Investment Interest Percentage	0.77%	1.00%
Maximum [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	15 years
Stock Options Exercise Price	$ 6.50	$ 6.50	$ 6.50
Minimum [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	3 years
Stock Options Exercise Price	$ 2.30	$ 2.76	$ 2.76