Note 4 - Inventories (Tables)

12 Months Ended

May 31, 2014

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

	As of May 31
	2014		2013
Raw materials and supplies	$	12,110		14,880
Work in process		9,146		8,356
Finished goods		27,895		22,705
	$	49,151		45,941