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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2011
Oct. 31, 2010
Oct. 31, 2011
Oct. 31, 2010
Net sales $ 71,330 $ 58,837 $ 188,721 $ 170,574
Cost of sales 58,898 45,282 157,263 132,524
Gross profit 12,432 13,555 31,458 38,050
Operating expenses        
General and administrative expenses 6,457 7,037 19,464 22,101
Selling expenses 3,743 3,500 11,318 10,268
Total operating expenses 10,200 10,537 30,782 32,369
lncome from operations 2,232 3,018 676 5,681
Income from joint ventures 683 695 584 574
Interest expense, net 395 371 1,014 1,060
Income before income taxes 2,520 3,342 246 5,195
Income tax expense (benefit) 1,834 (223) 2,889 (768)
Net income (loss) $ 686 $ 3,565 $ (2,643) $ 5,963
Weighted average number of common shares outstanding        
Basic 6,881 6,842 6,866 6,839
Diluted 6,881 6,842 6,866 6,865
Earnings (loss) per share        
Basic and diluted $ 0.1 $ 0.52 $ (0.38) $ 0.87