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Interest expense, net
 3 Months Ended
Apr. 30, 2013
Interest expense, net [Abstract]  
Interest Income and Interest Expense Disclosure [Text Block]
Interest expense, net.
 
Three Months Ended April 30,
 
2013

2012

Interest expense

$597


$501

Interest income
(107
)
(130
)
Interest expense, net

$490


$371