Derivative Liability (Narrative) (Details) (USD $)	9 Months Ended	12 Months Ended
	Apr. 30, 2013	Jul. 31, 2012	Apr. 24, 2013	Apr. 17, 2013
Sale of Stock [Line Items]
Fair value of warrants			$ 100,000	$ 119,000
Increase (Decrease) in Fair Value of Derivative Instruments, Not Designated as Hedging Instruments	33,000
Debt Instrument, Convertible, Conversion Price		$ 3.28
Debt Instrument, Convertible, If-converted Value in Excess of Principal		33,000
Note Warrant [Member]
Sale of Stock [Line Items]
Fair value of warrants	49,000	286,000
Increase (Decrease) in Fair Value of Derivative Instruments, Not Designated as Hedging Instruments	$ (237,000)