Consolidated Statements of Operations and Retained Earnings (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2011	Nov. 30, 2010
OPERATIONS
Net sales	$ 45,296	$ 36,621	$ 95,580	$ 82,448
Cost of sales	44,031	37,244	93,271	81,324
Gross profit (loss)	1,265	(623)	2,309	1,124
Selling and administrative expenses	7,191	7,151	15,087	14,981
Gain on sale of idle property, plant and equipment	2,500		2,500
Operating loss	(3,426)	(7,774)	(10,278)	(13,857)
Interest income	4	18	11	36
Loss before income taxes	(3,422)	(7,756)	(10,267)	(13,821)
Benefit from income taxes
Net loss	(3,422)	(7,756)	(10,267)	(13,821)
Basic loss per share	$ (0.40)	$ (0.93)	$ (1.22)	$ (1.65)
Cash dividends per share	$ 0.09	$ 0.18	$ 0.18	$ 0.36
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	129,943	162,636	137,543	170,211
Net loss	(3,422)	(7,756)	(10,267)	(13,821)
Cash dividends paid	(756)	(1,511)	(1,511)	(3,021)
Balance at end of period	$ 125,765	$ 153,369	$ 125,765	$ 153,369