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Note 5 - Inventories (Details) - Inventory (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
Aug. 31, 2014
May 31, 2014
Inventory [Abstract]      
Raw materials and supplies $ 14,101us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves   $ 12,110us-gaap_InventoryRawMaterialsAndSuppliesNetOfReserves
Work in process 6,855us-gaap_InventoryWorkInProcessNetOfReserves   9,146us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 26,444us-gaap_InventoryFinishedGoodsNetOfReserves   27,895us-gaap_InventoryFinishedGoodsNetOfReserves
$ 47,400us-gaap_InventoryNet $ 47,400us-gaap_InventoryNet $ 49,151us-gaap_InventoryNet