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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, 2013
May 31, 2012
OPERATIONS    
Net sales $ 177,574 $ 182,846
Cost of sales 166,111 177,962
Gross profit 11,463 4,884
Selling and administrative expenses 23,681 27,450
Gain on sale of idle property, plant and equipment 1,641 3,184
Operating loss (10,577) (19,382)
Interest income 64 17
Loss before income taxes (10,513) (19,365)
Benefit from income taxes      
Net loss (10,513) (19,365)
Basic loss per share $ (1.25) $ (2.31)
Cash dividends per share   $ 0.18
Weighted average number of common shares outstanding 8,391,244 8,391,244
RETAINED EARNINGS    
Balance at beginning of year 116,668 137,543
Net loss (10,513) (19,365)
Cash dividends paid   (1,510)
Balance at end of year $ 106,155 $ 116,668