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Interest expense, net (Tables)
6 Months Ended
Jul. 31, 2014
Interest expense, net [Abstract]  
Interest income and interest expense [Table Text Block]
 
Three Months Ended July 31,
Six Months Ended July 31,
 
2014

2013

2014

2013

Interest expense

$391


$510


$743


$1,095

Interest income
(128
)
(125
)
(243
)
(289
)
Interest expense, net

$263


$385


$500


$806