Income Taxes (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2017	Apr. 30, 2016
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 8,238,000		$ 8,238,000
Income tax benefit (expense)	(129,000)	$ 368,000	389,000	$ 972,000
Research And Development [Member]
Operating Loss Carryforwards [Line Items]
Income tax benefit (expense)			595,000
Federal [Member] | Research And Development [Member]
Operating Loss Carryforwards [Line Items]
Tax credit	449,000		449,000
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	316,000		316,000
State [Member] | Research And Development [Member]
Operating Loss Carryforwards [Line Items]
Tax credit	316,000		$ 316,000
International [Member] | Netherlands [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards expiration period			9 years
NOL valuation allowance	466,000	585,000	$ 466,000	585,000
Net deferred tax assets	0	$ 0	0	$ 0
International [Member] | India [Member]
Operating Loss Carryforwards [Line Items]
NOL valuation allowance	57,000		57,000
Net deferred tax assets	$ 0		$ 0