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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, 2014
May 31, 2013
OPERATIONS    
Net sales $ 191,730 $ 177,574
Cost of sales 181,443 166,111
Gross profit 10,287 11,463
Selling and administrative expenses 22,886 23,681
Gain on sale of idle property, plant and equipment 706 1,641
Operating loss (11,893) (10,577)
Interest expense (71)  
Interest income 100 64
Loss before income taxes (11,864) (10,513)
Benefit from income taxes 0 0
Net loss (11,864) (10,513)
Basic loss per share $ (1.41) $ (1.25)
Cash dividends per share $ 0 $ 0
Weighted average number of common shares outstanding 8,391,244 8,391,244
RETAINED EARNINGS    
Balance at beginning of year 106,155 116,668
Net loss (11,864) (10,513)
Balance at end of year $ 94,291 $ 106,155