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Investment in Equity Securities (Details Textual) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Schedule of Cost-method Investments [Line Items]
Equity Method Investments	$ 579,000		$ 579,000		$ 579,000
Other than Temporary Impairment Losses, Investments	0	$ 2,114,000	0	$ 2,114,000
Mevion Medical Systems Inc [Member]
Schedule of Cost-method Investments [Line Items]
Equity Method Investments	$ 579,000		$ 579,000
Equity Method Investment, Ownership Percentage	0.46%		0.46%
Investments, Fair Value Disclosure					579,000
Other than Temporary Impairment Losses, Investments					$ 2,140,000

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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