Stock-based compensation (Tables)

9 Months Ended

Oct. 31, 2012

Stock-based compensation [Abstract]

Stock-based compensation expense [Table Text Block]

	Three Months Ended October 31,		Nine Months Ended October 31,
	2012	2011	2012	2011
Stock-based compensation expense	$106	$173	$366	$470

Fair value assumptions [Table Text Block]

	Nine Months Ended October 31,
Fair value assumptions	2012	2011
Expected volatility	58.12% - 66.82%	51.72% - 66.82%
Risk free interest rate	.74% - 2.82%	1.54% - 5.13%
Dividend yield	none	none
Expected life	4.9 - 5.7 years	4.9 - 5.7 years

Option activity [Table Text Block]

Option activity	Options	Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Term in Years	Aggregate Intrinsic Value
Outstanding on February 1, 2012	843		$11.48	6.9		$430
Granted	158	6.88
Exercised	(11)	3.11			46
Expired or forfeited	(33)	10.47
Outstanding end of period	957	10.85		6.8	34
Exercisable end of period	580		$13.39	5.5		$34
Weighted-average fair value of options granted 2012			$6.88

Nonvested option activity [Table Text Block]

Unvested option activity	Unvested Options Outstanding	Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value
Outstanding on February 1, 2012	373		$7.84		$212
Granted	158	6.88
Vested	(144)
Expired or forfeited	(10)	7.07
Outstanding end of period	377		$6.96		$—