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Equity-based compensation
 9 Months Ended
Oct. 31, 2011
Equity-based Compensation [Abstract]  
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Equity-based compensation. The Company has equity-based compensation plans from which stock-based compensation awards can be granted to eligible employees, officers or directors.

 
Three Months Ended October 31,
Nine Months Ended October 31,
 
2011
2010
2011
2010
Stock-based compensation expense
$173
$204
$470
$686

The fair value of the outstanding option awards were estimated on the grant dates using the Black-Scholes option pricing model.
 
Nine Months Ended October 31,
Fair value assumptions
2011
2010
Expected volatility
51.72% - 66.82%
51.72%-66.82%
Risk-free interest rate
1.54% - 5.13%
1.88%-5.16%
Dividend yield
none
none
Expected life
4.9 - 5.7 years
5 - 7 years

Option activity
Options
Weighted-Average Exercise Price Per Share
Weighted-Average Remaining Contractual Term in Years
Aggregate Intrinsic Value
Outstanding on January 31, 2011
777

$11.88

6.9

$2,241

Granted
155
7.68

 
 
Exercised
(47)
3.51

 
187

Expired or forfeited
(27)
19.53

 
 
Outstanding end of period
858
11.34

7.0
364

 
 
 
 
 
Exercisable end of period
478

$14.12

5.7

$221

Weighted-average fair value of options granted during first nine months of 2011
 

$3.84

 
 

Unvested option activity
Unvested Options Outstanding
Weighted-Average Price Per Share
Aggregate Intrinsic Value
Outstanding on January 31, 2011
369
$9.98

$1,241

Granted
155
7.68
 
Vested
(142)
 
 
Expired or forfeited
(2)
8.70
 
Outstanding end of period
380
$7.84

$143


As of October 31, 2011, there was $1.2 million of total unrecognized compensation cost related to unvested stock options. The cost is expected to be recognized over a period of 2.6 years.