Consolidated Balance Sheets (Parenthetical) - $ / shares	May 31, 2018	May 31, 2017
Consolidated Balance Sheets Parenthetical Abstract
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	22,143,000	21,340,000
Common stock, shares outstanding	22,143,000	21,340,000