Quarterly report pursuant to Section 13 or 15(d)

Net income (loss) per share (Details)

v3.19.3.a.u2
Net income (loss) per share (Details) - shares
 3 Months Ended
Oct. 31, 2019
Oct. 31, 2018
Unvested Restricted Stock [Member] | In the Money Stock Options [Member]    
Net income (loss) per share (Details) [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 127,000 135,000
Outstanding Options [Member] | Out of the Money Stock Options [Member]    
Net income (loss) per share (Details) [Line Items]    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 1,319,000 1,330,000