Stock-based compensation (Tables)

3 Months Ended

Apr. 30, 2014

Stock-based compensation [Abstract]

Stock-based compensation expense [Table Text Block]

	Three Months Ended April 30,
	2014			2013
Stock-based compensation (benefit) expense		($381	)		$119
Restricted stock based compensation expense		($69	)		$—

Fair value assumptions [Table Text Block]

	Three Months Ended April 30,
Fair value assumptions	2014	2013
Expected volatility	42.12% - 60.26%	53.90% - 65.54%
Risk free interest rate	.74% - 2.19%	.74% - 2.82%
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 at January 31, 2014	776			$11.69	6.1		$3,859
Exercised	(22	)	7.40			1,082
Expired or forfeited	(47	)	20.64
Outstanding end of period	707		11.23		5.9	1,697
Exercisable end of period	449			$12.91	4.6		$1,023

Unvested option activity [Table Text Block]

Unvested option activity	Unvested Options Outstanding		Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value
Outstanding at January 31, 2014	263			$8.31		$1,633
Expired or forfeited	(5	)	8.24
Outstanding end of period	258			$8.31		$673