Consolidated Balance Sheets - Unaudited (Parentheticals) - USD ($) $ in Thousands	May 31, 2020	Aug. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, net of reserve	$ 7,357	$ 10,511
Preferred stock, par value (in USD 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 USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	40,556,920	40,104,192
Common stock, shares outstanding (in shares)	37,907,127	38,117,840
Treasury stock, shares	2,649,793	1,986,352