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Interest expense, net (Tables)
6 Months Ended
Jul. 31, 2015
Interest expense, net [Abstract]  
Interest income and interest expense [Table Text Block]
 
Three Months Ended July 31,
Six Months Ended July 31,
 
2015

2014

2015

2014

Interest expense

$269


$391


$537


$743

Interest income
(17
)
(128
)
(291
)
(243
)
Interest expense, net

$252


$263


$246


$500