Quarterly report pursuant to Section 13 or 15(d)

Net income (loss) per share (Details)

v3.6.0.2
Net income (loss) per share (Details) - shares
 3 Months Ended 6 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
In the Money Stock Options [Member]        
Net income (loss) per share (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 888,000   888,000  
Unvested Restricted Stock [Member]        
Net income (loss) per share (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 804,000   804,000  
Weighted Average Stock Options [Member]        
Net income (loss) per share (Details) [Line Items]        
Antidilutive Securities Included In Computation Of Earnings Per Share Amount 440,000   281,000  
Outstanding Options [Member]        
Net income (loss) per share (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 494,000 235,000 247,000 305,000