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Net loss per share (Details)	3 Months Ended
Net loss per share (Details)	Oct. 31, 2013	Oct. 31, 2012
Unvested Restricted Stock [Member]
Net loss per share (Details) [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	51,000	0
Outstanding Options [Member]
Net loss per share (Details) [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	723,000	686,000

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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