CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Statements of Operations [Abstract]
Net sales	$ 58,325	$ 71,330	$ 163,314	$ 188,721
Cost of sales	46,879	58,898	132,834	157,263
Gross profit	11,446	12,432	30,480	31,458
Operating expenses
General and administrative expenses	6,925	6,457	20,886	19,464
Selling expenses	3,840	3,743	11,303	11,318
Total operating expenses	10,765	10,200	32,189	30,782
Income (loss) from operations	681	2,232	(1,709)	676
Income from joint venture	531	683	354	584
Interest expense, net	594	395	1,385	1,014
Income (loss) before income taxes	618	2,520	(2,740)	246
Income tax expense	163	1,834	218	2,889
Net income (loss)	$ 455	$ 686	$ (2,958)	$ (2,643)
Weighted average number of common shares outstanding
Basic and diluted	6,924	6,881	6,921	6,866
Earnings (loss) per share
Basic and diluted	$ 0.07	$ 0.10	$ (0.43)	$ (0.38)