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Net loss per share (Details)	3 Months Ended
Net loss per share (Details)	Oct. 31, 2014	Oct. 31, 2013
Unvested Restricted Stock [Member]
Net loss per share (Details) [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	18,000	51,000
In the Money Stock Options [Member]
Net loss per share (Details) [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	465,000	0
Outstanding Options [Member]
Net loss per share (Details) [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	142,000	723,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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