Earnings Per Share (Details) - USD ($)	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average performance shares outstanding during the period that are excluded from EPS Calculation (in shares)	252,000	227,000
Net loss for basic calculation	$ (1,660,000)	$ (2,489,000)
Numerator for diluted calculation	$ (1,660,000)	$ (2,489,000)
Denominator for basic calculation (in shares)	23,797,000	23,385,000
Denominator for diluted calculation (in shares)	23,797,000	23,385,000
Stock options, performance shares (with the performance conditions satisfied), RSUs and restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive equity-classified stock-based awards not included in calculation of diluted earnings per share (in shares)	2,246,000	2,419,000