Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 31, 2016	Jul. 31, 2015
Accounts receivable, allowance for doubtful accounts	$ 1,070	$ 1,220
Common stock, par value	$ 0.05	$ 0.05
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	12,396,765	12,434,017
Common stock, shares outstanding	12,396,765	12,434,017