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Stock options Unvested options (Tables)
 12 Months Ended
Jan. 31, 2018
Unvested options [Abstract]  
Schedule of Nonvested Share Activity [Table Text Block]
Unvested options outstanding (shares in thousands)
Options
Weighted-average grant date fair value
Aggregate intrinsic value
Outstanding on January 31, 2017
74

$9.31
$69
Granted
—

—

 
Vested
(36
)
 
 
Expired or forfeited
(7
)
10.43

 
Outstanding on January 31, 2018
31

$8.24
$50