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Balance Sheet Details (Schedule of Patents) (Details) (USD $)	12 Months Ended
	Jul. 31, 2012 Y	Jul. 31, 2011
Balance Sheet Related Disclosures [Abstract]
Patents	$ 3,773,000	$ 3,534,000
Less accumulated amortization	(1,823,000)	(1,617,000)
Patents Net	1,950,000	1,917,000
Patent Amortization Expense	206,000	186,000
Weighted Average Remaining Amortization Period For Patents	10
Future Amortization Of Intangible Assets, Estimate	$ 226,000

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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