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Basis of Presentation (Details Textual) € in Millions	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	May. 31, 2014 USD ($)	May. 31, 2014 EUR (€)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Basis Of Presentation [Line Items]
Foreign Currency Transaction Gain, before Tax				$ 146,000		$ 161,000
Proceeds from Divestiture of Interest in Consolidated Subsidiaries					$ 0	768,000
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent, Total							$ 779,000
Other than Temporary Impairment Losses, Investments			$ 2,114,000	$ 0	2,114,000	$ 0
Mevion Medical Systems Inc [Member]
Basis Of Presentation [Line Items]
Investments, Fair Value Disclosure, Total			$ 600,000		600,000
Other than Temporary Impairment Losses, Investments					$ 2,114,000
EWRS Turkey [Member]
Basis Of Presentation [Line Items]
Equity Method Investment, Ownership Percentage			100.00%		100.00%
Sale of EWRS Turkey [Member]
Basis Of Presentation [Line Items]
Proceeds from Divestiture of Interest in Consolidated Subsidiaries					$ 768,000
Divestiture of Subsidiary, Gross Sale value	$ 6,000,000	€ 4.2
Income (Loss) from Subsidiaries, Net of Tax					$ 572,000

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