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Stock options Unvested options (Tables)
 12 Months Ended
Jan. 31, 2017
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 on January 31, 2016
166

$9.51
$3
Granted
22

7.33

 
Vested
(72
)
 
 
Expired or forfeited
(42
)
8.98

 
Outstanding on January 31, 2017
74

$9.31
$69