Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Current Income Tax Expense (Benefit)	$ 5,000	$ 2,000
Tax Credit Carryforward, Deferred Tax Asset	17.3
Valuation Allowance, Deferred Tax Asset, Change in Amount	2,657,000
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards	70.7	64.7
Operating Loss Carryforwards, Expiration Dates	July 31, 2031
State and Local Jurisdiction [Member]
Operating Loss Carryforwards	60.0	54.6
Operating Loss Carryforwards Near Term Expiration	$ 1.9
Maximum [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Expiration Dates	July 31, 2031
Maximum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Expiration Dates	July 31, 2031
Minimum [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Expiration Dates	July 31, 2018
Minimum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Expiration Dates	July 31, 2014