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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. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
OPERATIONS        
Net sales $ 36,986 $ 36,805 $ 128,742 $ 132,385
Cost of sales 36,515 37,497 122,538 130,768
Gross profit (loss) 471 (692) 6,204 1,617
Selling and administrative expenses 5,861 6,698 18,210 21,785
Gain on sale of idle property, plant and equipment     1,411 2,500
Operating loss (5,390) (7,390) (10,595) (17,668)
Interest income 25 3 37 14
Loss before income taxes (5,365) (7,387) (10,558) (17,654)
Benefit from income taxes            
Net loss (5,365) (7,387) (10,558) (17,654)
Basic loss per share $ (0.64) $ (0.88) $ (1.26) $ (2.10)
Cash dividends per share       $ 0.18
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 111,475 125,765 116,668 137,543
Net loss (5,365) (7,387) (10,558) (17,654)
Cash dividends paid       (1,511)
Balance at end of period $ 106,110 $ 118,378 $ 106,110 $ 118,378