Common Stock Investment	6 Months Ended
Jun. 30, 2013
Investments, All Other Investments [Abstract]
Cost-method Investments, Description [Text Block]	Note 4. Common Stock Investment As of June 30, 2013 the Company has a $2,701,000 investment in the common stock of Mevion Medical Systems, Inc. (“Mevion”), formerly Still River Systems, Inc., representing an approximate 0.77% interest in Mevion. Compared to December 31, 2012 the investment was $2,687,000 which represented a 1.0% interest in the convertible preferred stock of Mevion. In order to remain preferred each investor was asked to contribute the pro rata share of their investment as of April 2013. The Company chose not to make an additional investment at this time therefore the Company’s investment was converted from preferred stock to common stock in April 2013. The Company accounts for this investment under the cost method. In June 2013 Mevion announced that it had secured a $55 million round of financing which will be used to accelerate the manufacturing and deployment of the Mevion S250. The funds were raised from existing equity investors, as well as from debt financing. The Company invested an additional $14,000 in this round, which was less than its full entitlement. The Company reviews its investment 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 evaluated this investment for impairment at December 31, 2012 and reviewed it at June 30, 2013 in light of both current market conditions and the ongoing needs of Mevion to raise cash to continue its development of the first compact, single room PBRT system. Based on its analysis, the Company estimates that there is currently an unrealized loss (impairment) of approximately $2.4 million. In assessing whether the impairment is other than temporary, we evaluated the length of time and extent to which market value has been below cost, the financial condition and near term prospects of Mevion and our ability and intent to retain our investment for a period sufficient to allow for an anticipated recovery in the market value. Although the investment is not without risk, and the manufacture of the first unit has taken longer than originally anticipated, the Company believes that the current market value is a temporary situation brought on solely due to the delays in treating the first clinical patient. During the second quarter of 2012, Mevion announced that it had received FDA 510(k) clearance for its MEVION S250 system, which enables users of the system to treat patients immediately upon completion of system installation. Mevion had previously announced that it had received the CE Mark certification which enables Mevion to market, sell and install these systems through the European Union and any country that recognizes the CE Mark. Based on the continuing progress being made by Mevion toward the manufacture and installation of the first single room PBRT system, the Company believes that our investment in Mevion is not other than temporarily impaired, and the fair value will increase so that the carrying value will be recovered.

Note 4. Common Stock Investment

As of June 30, 2013 the Company has a $2,701,000 investment in the common stock of Mevion Medical Systems, Inc. (“Mevion”), formerly Still River Systems, Inc., representing an approximate 0.77% interest in Mevion. Compared to December 31, 2012 the investment was $2,687,000 which represented a 1.0% interest in the convertible preferred stock of Mevion. In order to remain preferred each investor was asked to contribute the pro rata share of their investment as of April 2013. The Company chose not to make an additional investment at this time therefore the Company’s investment was converted from preferred stock to common stock in April 2013. The Company accounts for this investment under the cost method.

In June 2013 Mevion announced that it had secured a $55 million round of financing which will be used to accelerate the manufacturing and deployment of the Mevion S250. The funds were raised from existing equity investors, as well as from debt financing. The Company invested an additional $14,000 in this round, which was less than its full entitlement.

The Company reviews its investment 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 evaluated this investment for impairment at December 31, 2012 and reviewed it at June 30, 2013 in light of both current market conditions and the ongoing needs of Mevion to raise cash to continue its development of the first compact, single room PBRT system. Based on its analysis, the Company estimates that there is currently an unrealized loss (impairment) of approximately $2.4 million.

In assessing whether the impairment is other than temporary, we evaluated the length of time and extent to which market value has been below cost, the financial condition and near term prospects of Mevion and our ability and intent to retain our investment for a period sufficient to allow for an anticipated recovery in the market value. Although the investment is not without risk, and the manufacture of the first unit has taken longer than originally anticipated, the Company believes that the current market value is a temporary situation brought on solely due to the delays in treating the first clinical patient.

During the second quarter of 2012, Mevion announced that it had received FDA 510(k) clearance for its MEVION S250 system, which enables users of the system to treat patients immediately upon completion of system installation. Mevion had previously announced that it had received the CE Mark certification which enables Mevion to market, sell and install these systems through the European Union and any country that recognizes the CE Mark. Based on the continuing progress being made by Mevion toward the manufacture and installation of the first single room PBRT system, the Company believes that our investment in Mevion is not other than temporarily impaired, and the fair value will increase so that the carrying value will be recovered.