Note 8 - Commitments and Contingencies Foreign Tax Claim In July 2007, a dissolved former Canadian subsidiary of the Company, CADx Medical Systems Inc. (CADx Medical), received a tax re-assessment of approximately $6,800,000 from the Canada Revenue Agency (CRA) resulting from CRAs audit of CADx Medicals Canadian federal tax return for the year ended December 31, 2002. In February 2010 the CRA reviewed the matter and reduced the tax re-assessment to approximately $703,000, excluding interest and penalties. The Company believes that it is not liable for the re-assessment against CADx Medical and no accrual has been recorded for this matter as of March 31, 2017. Settlement Obligations In connection with the acquisition of Xoft in 2010, the Company recorded a royalty obligation pursuant to a settlement agreement entered into between Xoft and Hologic in August 2007. Xoft received a nonexclusive, irrevocable, perpetual, worldwide license, including the right to sublicense certain Hologic patents, and a non-compete covenant as well as an agreement not to seek further damages with respect to the alleged patent violations. In return, the Company has a remaining obligation to pay a minimum annual royalty payment to Hologic, of $250,000 payable through 2016. In addition to the minimum annual royalty payments, the litigation settlement agreement with Hologic also provided for payment of royalties based upon a specified percentage of future net sales on any products that utilize the licensed rights. The Company has a liability within accounts payable and accrued expenses for future payment and for future minimum royalty obligations totaling $448,000 as of March 31, 2017. The Company recorded interest expense of approximately $0 and $10,000 in three months ended March 31, 2017, and March 31, 2016, respectively, related to this obligation. In December, 2011, the Company agreed to a settlement related to litigation with Carl Zeiss Meditec AG. The Company is obligated to pay the remaining amount of $0.5 million in June 2017