Significant accounting policies immaterial errors (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Net Income (Loss) Attributable to Parent	$ (18,485)	$ (4,959)
Inventories, net	42,333	40,204
Total current assets	84,346	82,670
Total assets	149,479	157,283
Retained earnings	4,553	23,038
Total stockholders' equity	54,255	72,355	78,262
Total liabilities and stockholders' equity	149,479	157,283
Cost of sales	173,911	197,175
Gross Profit	38,107	36,321
Loss from operations		(5,063)
Loss before income taxes	(7,695)	(4,942)
Inventories	(2,080)	(4,683)
Restatement Adjustment [Member]
Net Income (Loss) Attributable to Parent		28
Inventories, net		236
Total current assets		236
Total assets		236
Retained earnings		236
Total stockholders' equity		236
Total liabilities and stockholders' equity		236
Cost of sales		(28)
Gross Profit		28
Loss from operations		28
Loss before income taxes		28
Inventories		28
Scenario, Previously Reported [Member]
Net Income (Loss) Attributable to Parent		(4,987)
Inventories, net		39,968
Total current assets		82,434
Total assets		157,047
Retained earnings		22,802
Total stockholders' equity		72,119
Total liabilities and stockholders' equity		157,047
Cost of sales		197,203
Gross Profit		36,293
Loss from operations		(5,091)
Loss before income taxes		(4,970)
Inventories		4,655
Retained Earnings
Net Income (Loss) Attributable to Parent	(18,485)	(4,959)
Total stockholders' equity	$ 4,553	$ 23,038	$ 27,997