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ACCOUNTING POLICIES (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Accounting Policies [Line Items]
Interest Costs Capitalized	$ 115,000	$ 138,000	$ 443,000
Property Subject to or Available for Operating Lease, Net, Total	94,031,000	95,923,000
Property Subject to or Available for Operating Lease, Accumulated Depreciation	$ 53,716,000	$ 51,403,000
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	519,000	14,000	581,000
Stock Options Exercise Price		$ 3.90
Advertising Expense	$ 113,000	$ 140,000	$ 279,000
Insurance Settlements Receivable, Current	1,137,000	$ 0
Revenue from Contract with Customer, Including Assessed Tax	$ 18,987,000
Percentage of Tax Benefit Realized Upon Settlement	50.00%
Mevion Medical Systems Inc [Member]
Accounting Policies [Line Items]
Gain on Business Interruption Insurance Recovery	$ 185,000
Sales Revenue, Net [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage	100.00%	100.00%	100.00%
Customer One [Member] | Sales Revenue, Net [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage	26.00%	21.00%	10.00%
Restricted Stock Units (RSUs) [Member]
Accounting Policies [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	4,000	4,000	4,000
Accounting Standards Update 2014-09 [Member]
Accounting Policies [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 727,000
Accounting Standards Update 2016-02 [Member]
Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset				$ 1,000,000
PBRT [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	20 years
Mevion Medical Systems Inc [Member]
Accounting Policies [Line Items]
Cost of Property Repairs and Maintenance	$ 977,000
Mevion Medical Systems Inc [Member] | Insurance Settlement Receivable Current [Member]
Accounting Policies [Line Items]
Cost of Property Repairs and Maintenance	$ 977,000
Maximum [Member]
Accounting Policies [Line Items]
Stock Options Exercise Price	$ 3.90		$ 3.15
Maximum [Member] | Medical and Office equipment [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum [Member]
Accounting Policies [Line Items]
Stock Options Exercise Price	$ 2.82		$ 2.43
Minimum [Member] | Customer Three [Member] | Accounts Receivable [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage	10.00%	10.00%
Minimum [Member] | Medical and Office equipment [Member]
Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	3 years

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