Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Operating Loss Carryforwards [Line Items]
Current Income Tax Expense (Benefit)	$ 1,600	$ 1,600
Tax Credit Carryforward, Deferred Tax Asset	18,600,000
Valuation Allowance, Deferred Tax Asset, Change in Amount	$ 3,800,000
Ownership Change Percent Points Of Outstanding Stock	50.00%
Accrued interest or penalties		0	$ 0
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 89,800,000	83,600,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 77,100,000	$ 71,800,000