Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Aug. 31, 2015	May. 31, 2015
Condensed Consolidated Balance Sheets Parenthetical
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	12,987,000	12,857,000
Common stock, shares outstanding	12,987,000	12,857,000