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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
May 31, 2019
Aug. 31, 2018
Condensed Consolidated Balance Sheets [Abstract]    
Trade and other accounts receivable, less allowance for doubtful accounts $ 351 $ 340
Common stock, shares authorized 36,000,000 36,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares issued 19,770,339 19,729,774
Common stock, shares outstanding 13,758,794 13,850,413
Treasury stock, shares 6,011,545 5,879,361