Note 5 - Inventories, Net (Tables)

3 Months Ended

Aug. 31, 2015

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

	As of
	August 31, 2015		May 31, 2015
Raw materials and supplies	$	14,171		10,816
Work in process		8,795		9,197
Finished goods		25,487		21,834
	$	48,453		41,847