Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details Textual)

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Inventories (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2012
Jul. 31, 2011
Inventory write-down $ 1,752 $ 0 $ 1,752 $ 0