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Consolidated Statements of Operations and Retained Earnings (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
May 31, 2012
May 31, 2011
OPERATIONS    
Net sales $ 182,846 $ 162,327
Cost of sales 177,962 160,525
Gross profit 4,884 1,802
Selling and administrative expenses 27,450 28,490
Gain on sale of idle property, plant and equipment 3,184  
Operating loss (19,382) (26,688)
Interest income 17 61
Loss before income taxes (19,365) (26,627)
Benefit from income taxes      
Net loss (19,365) (26,627)
Basic loss per share $ (2.31) $ (3.17)
Cash dividends per share $ 0.18 $ 0.72
Weighted average number of common shares outstanding 8,391,244 8,391,244
RETAINED EARNINGS    
Balance at beginning of year 137,543 170,211
Net loss (19,365) (26,627)
Cash dividends paid (1,510) (6,041)
Balance at end of year $ 116,668 $ 137,543