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Consolidated Statements of Operations and Retained Earnings (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
OPERATIONS        
Net sales $ 36,805 $ 31,776 $ 132,385 $ 114,224
Cost of sales 37,497 33,494 130,768 114,818
Gross (loss) profit (692) (1,718) 1,617 (594)
Selling and administrative expenses (6,698) (7,039) (21,785) (22,020)
Gain on sale of idle property, plant and equipment     2,500  
Operating loss (7,390) (8,757) (17,668) (22,614)
Interest income 3 15 14 51
Loss before income taxes (7,387) (8,742) (17,654) (22,563)
Benefit from income taxes            
Net loss (7,387) (8,742) (17,654) (22,563)
Basic loss per share $ (0.88) $ (1.04) $ (2.10) $ (2.69)
Cash dividends per share   $ 0.18 $ 0.18 $ 0.54
Weighted average number of common shares outstanding 8,391,244 8,391,244 8,391,244 8,391,244
RETAINED EARNINGS        
Balance at beginning of period 125,765 153,369 137,543 170,211
Net loss (7,387) (8,742) (17,654) (22,563)
Cash dividends paid   (1,510) (1,511) (4,531)
Balance at end of period $ 118,378 $ 143,117 $ 118,378 $ 143,117