Quarterly report pursuant to Section 13 or 15(d)

Net income (loss) per share (Details)

v3.5.0.2
Net income (loss) per share (Details) - shares
 3 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Unvested Restricted Stock [Member]    
Net income (loss) per share (Details) [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 720,000  
In the Money Stock Options [Member]    
Net income (loss) per share (Details) [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 720,000  
Weighted Average Stock Options [Member]    
Net income (loss) per share (Details) [Line Items]    
Antidilutive Securities Included In Computation Of Earnings Per Share Amount   125,000
Outstanding Options [Member]    
Net income (loss) per share (Details) [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0 374,000