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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
May 31, 2018
Aug. 31, 2017
Condensed Consolidated Balance Sheets [Abstract]    
Trade and other accounts receivable, allowance for doubtful accounts $ 273 $ 240
Common stock, shares authorized 36,000,000 36,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares issued 19,729,708 19,688,238
Common stock, shares outstanding 13,880,647 13,984,183
Treasury stock, shares 5,849,061 5,704,055