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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2013
Jan. 31, 2012
Components of inventories    
Materials and Supplies $ 6,654 $ 7,147
Work-in-Progress 591 1,024
Finished Goods 3,934 2,468
Inventories, Net $ 11,179 $ 10,639