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Stock options Unvested options (Tables)
 12 Months Ended
Jan. 31, 2015
Unvested options [Abstract]  
Schedule of Nonvested Share Activity [Table Text Block]
Unvested options outstanding
Options

Weighted-average grant date fair value

Aggregate intrinsic value
Outstanding at January 31, 2014
263

$6.91
$4
Granted
97

12.41

 
Vested
(115
)
 
 
Expired or forfeited
(13
)
8.59

 
Outstanding at January 31, 2015
232

$10.11
$0