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Interest expense, net (Tables)
3 Months Ended
Apr. 30, 2017
Interest Income (Expense), Net [Abstract]  
Interest income and interest expense [Table Text Block]
 
Three Months Ended April 30,
 
2017

2016

Interest expense

$165


$253

Interest income
(8
)
(27
)
Interest expense, net

$157


$226