Quarterly report pursuant to Section 13 or 15(d)

Net income (loss) per share (Details)

v3.8.0.1
Net income (loss) per share (Details) - shares
 3 Months Ended 6 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Weighted Average Stock Options [Member]        
Net income (loss) per share (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount   888,000   804,000
Outstanding Options [Member]        
Net income (loss) per share (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 494,000 0 247,000
In the Money Stock Options [Member] | Unvested Restricted Stock [Member]        
Net income (loss) per share (Details) [Line Items]        
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 719,000   825,000