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Investment in Equity Securities
3 Months Ended
Mar. 31, 2017
Investments, All Other Investments [Abstract]  
Cost-method Investments, Description [Text Block]
Note 4.
Investment in Equity Securities
 
As of March 31, 2017 and December 31, 2016 the Company had a $579,000 investment in the common stock of Mevion Medical Systems, Inc. (“Mevion”) formerly Still River Systems, representing an approximate 0.46% interest in Mevion. The Company accounts for this investment under the cost method. The Company carries its investment in Mevion at cost and reviews it for impairment on a quarterly basis, or as events or circumstances might indicate that the carrying value of the investment may not be recoverable.
 
The Company reviewed this investment at March 31, 2017 in light of both current market conditions and the current operations of Mevion as they continue to grow their PBRT business. Based on its analysis, the Company determined no impairment needed to be recognized as of March 31, 2017.