Consolidated Statements of Operations and Retained Earnings (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 28, 2014	Feb. 28, 2013
OPERATIONS
Net sales	$ 38,772	$ 36,986	$ 134,029	$ 128,742
Cost of sales	38,918	36,515	126,625	122,538
Gross (loss) profit	(146)	471	7,404	6,204
Selling and administrative expenses	5,891	5,861	17,245	18,210
Gain on sale of idle property, plant and equipment	300		462	1,411
Operating loss	(5,737)	(5,390)	(9,379)	(10,595)
Interest income	25	25	75	37
Loss before income taxes	(5,712)	(5,365)	(9,304)	(10,558)
Benefit from income taxes
Net loss	(5,712)	(5,365)	(9,304)	(10,558)
Basic loss per share	$ (0.68)	$ (0.64)	$ (1.11)	$ (1.26)
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	102,563	111,475	106,155	116,668
Net loss	(5,712)	(5,365)	(9,304)	(10,558)
Balance at end of period	$ 96,851	$ 106,110	$ 96,851	$ 106,110