Stock-based compensation (Tables)

3 Months Ended

Apr. 30, 2013

Stock-based compensation [Abstract]

Stock-based compensation expense [Table Text Block]

	Three Months Ended April 30,
	2013		2012
Stock-based compensation expense		$119		$86

Fair value assumptions [Table Text Block]

	Three Months Ended April 30,
Fair value assumptions	2013	2012
Expected volatility	53.90% - 65.54%	58.12% - 66.82%
Risk free interest rate	.74% - 2.82%	1.54% - 3.57%
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 beginning of year	969			$10.77	6.6		$40
Exercised	(8	)	6.38			6
Expired or forfeited	(6	)	6.95
Outstanding end of period	955		10.84		6.3	373
Exercisable end of period	596			$13.20	5.1		$199

Nonvested option activity [Table Text Block]

Unvested option activity	Unvested Options Outstanding		Weighted Average Exercise Price Per Share		Aggregate Intrinsic Value
Outstanding at beginning of year	383			$6.91		$4
Vested	(18	)
Expired or forfeited	(6	)	6.95
Outstanding end of period	359			$6.92		$173