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Stock options Unvested options (Tables)
 12 Months Ended
Jan. 31, 2013
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 beginning of year
373

$7.84
$212
Granted
173

6.78

 
Vested
(152
)
 
 
Expired or forfeited
(11
)
7.06

 
Outstanding at end of year
383

$6.91
$4