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Note 5 - Inventories (Details) - Inventory (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	May 31, 2014
Inventory [Abstract]
Raw materials and supplies	$ 13,876	$ 12,110
Work in process	8,330	9,146
Finished goods	24,854	27,895
	$ 47,060us-gaap_InventoryNet	$ 49,151us-gaap_InventoryNet

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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