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Consolidated Statements of Operations and Retained Earnings (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2013
Nov. 30, 2012
OPERATIONS:        
Net sales $ 46,263 $ 41,836 $ 95,257 $ 91,756
Cost of sales 43,042 39,162 87,707 86,023
Gross profit 3,221 2,674 7,550 5,733
Selling and administrative expenses 5,621 5,819 11,354 12,349
Gain on sale of idle property, plant and equipment 162 1,411 162 1,411
Operating loss (2,238) (1,734) (3,642) (5,205)
Interest income 25 9 50 12
Loss before income taxes (2,213) (1,725) (3,592) (5,193)
Benefit from income taxes            
Net loss (2,213) (1,725) (3,592) (5,193)
Basic loss per share $ (0.27) $ (0.21) $ (0.43) $ (0.62)
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 104,776 113,200 106,155 116,668
Net loss (2,213) (1,725) (3,592) (5,193)
Balance at end of period $ 102,563 $ 111,475 $ 102,563 $ 111,475