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ACCOUNTING POLICIES (Detail Textual) (USD $)
 12 Months Ended
Dec. 31, 2012
Customers
Dec. 31, 2011
Customers
Dec. 31, 2010
Sep. 05, 2007
Apr. 10, 2006
Line of Credit Facility, Maximum Amount Outstanding $ 9,000,000        
Number of Customers 19 21      
Preferred Stock Fair Value 1,383,000 1,383,000      
Interest Costs Capitalized 196,000 136,000      
Property Subject to or Available for Operating Lease, Net 80,884,000 77,147,000      
Property Subject to or Available for Operating Lease, Accumulated Depreciation 38,515,000 33,105,000      
Cost Method Investments 2,687,000 2,656,000   617,000 2,000,000
Debt Instrument, Fair Value Disclosure 34,577,000 35,743,000      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 588,000 570,000 355,000    
Foreign Currency Transaction Gain, before Tax 133,000 27,000 0    
Mevion Medical Systems Inc [Member]
          
Cost Method Investment, Interest Percentage 1.00%        
Maximum [Member]
          
Property, Plant and Equipment, Estimated Useful Lives 15 years        
Stock Options Exercise Price $ 6.50 $ 6.50 $ 6.50    
Minimum [Member]
          
Property, Plant and Equipment, Estimated Useful Lives 3 years        
Stock Options Exercise Price $ 2.76 $ 2.76 $ 2.96    
Certificates of Deposit [Member]
          
Line of Credit Facility, Maximum Amount Outstanding $ 9,000,000 $ 9,000,000      
Investment Interest Rate 0.45% 0.45%      
Investment Maturity Date Aug. 31, 2013 Aug. 31, 2012