Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Aug. 31, 2018	Aug. 31, 2017
Accounts receivable, reserves	$ 3,490	$ 2,738
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	39,264,849	51,845,132
Common stock, shares outstanding (in shares)	38,192,586	39,023,032
Treasury stock, shares (in shares)	1,072,263	12,822,100