Correction of immaterial errors Adjustments to the previously reported statement of operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales	$ 95,955	$ 96,149
Gross profit	26,741	30,774
General and administrative expense	18,869	19,202
Operating Expenses	23,863	24,927
Income from operations	2,878	5,847
Income from continuing operations before income taxes	3,010	7,288
Income from continuing operations	1,635	4,237
Net loss	$ (4,409)	(181)
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales		96,247
Gross profit		30,676
General and administrative expense		19,179
Operating Expenses		24,904
Income from operations		5,772
Income from continuing operations before income taxes		7,213
Income from continuing operations		4,162
Net loss		(256)
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Cost of sales		(98)
Gross profit		98
General and administrative expense		23
Operating Expenses		23
Income from operations		75
Income from continuing operations before income taxes		75
Income from continuing operations		75
Net loss		$ 75