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Balance Sheet Details (Schedule of Patents) (Details) (USD $)	12 Months Ended
	Jul. 31, 2013 Y	Jul. 31, 2012
Balance Sheet Details [Abstract]
Patents	$ 3,389,000	$ 3,773,000
Less accumulated amortization	(1,959,000)	(1,823,000)
Patents, net	1,430,000	1,950,000
Patent Amortization Expense	188,000	206,000
Weighted Average Remaining Amortization Period For Patents	10
Future Amortization Of Intangible Assets, Estimate	152,000
Impairment of patents	$ 551,000	$ 0

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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