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6. INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2014
May 31, 2014
Inventory, Net [Abstract]    
Raw materials and sub-assemblies $ 3,187us-gaap_InventoryRawMaterialsNetOfReserves $ 3,348us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 2,617us-gaap_InventoryWorkInProcessNetOfReserves 2,585us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 231us-gaap_InventoryFinishedGoodsNetOfReserves 215us-gaap_InventoryFinishedGoodsNetOfReserves
Inventory $ 6,035us-gaap_InventoryNet $ 6,148us-gaap_InventoryNet [1]
[1] The condensed consolidated balance sheet at May 31, 2014 has been derived from the audited consolidated financial statements at that date.