Sales Concentration (Details) (USD $)	12 Months Ended
Jul. 31, 2013	Jul. 31, 2012
Concentration Risk [Line Items]
Sales Revenue, Goods, Net	$ 820,000	$ 812,000
Concentration Risk, Geographic	The geographic breakdown of net product sales was as follows: 86% U.S. and 14% foreign.	The geographic breakdown of net product sales was as follows: 92% U.S. and 8% foreign.
Sales Revenue, Goods, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Customer	three	two
Concentration Risk, Percentage	69.00%	67.00%
U.S. Concentration Risk, Percentage	86.00%	92.00%
Foreign Concentration Risk Percentage	14.00%	8.00%
Maximum [Member] \| Sales Revenue, Goods, Net [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage	10.00%	10.00%

Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures).

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Description of risks that arise due to concentrations of operating facilities, revenues, assets, customers, vendors or the like in a certain geographic area, either domestic or foreign. The description may address risks inherent in the geographic area, and, at a minimum, informs users of the general nature of the risk, but excludes "Information about Geographic Areas" that may be disclosed elsewhere (for instance, segment disclosures)..

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