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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 |  |  |

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