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Investment in Equity Securities (Details Textual) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 30, 2015	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Schedule of Cost-method Investments [Line Items]
Cost Method Investments		$ 579,000	$ 579,000		$ 579,000		$ 579,000
Other than Temporary Impairment Losses, Investments		0		$ 0	0	$ 2,114,000
Cost-method Investments, Other than Temporary Impairment			26,000
Mevion Medical Systems Inc [Member]
Schedule of Cost-method Investments [Line Items]
Cost Method Investments		579,000	579,000		579,000		579,000
Investments, Fair Value Disclosure	$ 600,000	$ 579,000	$ 579,000		$ 579,000		579,000
Other than Temporary Impairment Losses, Investments	$ 2,114,000						$ 2,140,000
Cost Method Investments Ownership Percentage					0.46%

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- Definition

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

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Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the cost method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

+ References

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Publisher FASB
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