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Interest expense, net
 9 Months Ended
Oct. 31, 2011
Interest Expense, Net [Abstract]  
Interest Income and Interest Expense Disclosure [Text Block]
Interest expense, net.
 
Three Months Ended October 31,
Nine Months Ended October 31,
 
2011

2010

2011

2010

Interest expense

$584


$522


$1,655


$1,440

Interest income
(189
)
(151
)
(641
)
(380
)
Interest expense, net

$395


$371


$1,014


$1,060