Note 4 - Inventories (Tables)

6 Months Ended

Nov. 30, 2013

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

	As of
	November 30, 2013		May 31, 2013
Raw materials and supplies	$	15,991		14,880
Work in process		10,038		8,356
Finished goods		21,698		22,705
	$	47,727		45,941