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, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
OPERATIONS:
Net sales	$ 41,836	$ 45,296	$ 91,756	$ 95,580
Cost of sales	39,162	44,031	86,023	93,271
Gross profit	2,674	1,265	5,733	2,309
Selling and administrative expenses	5,819	7,191	12,349	15,087
Gain on sale of idle property, plant and equipment	1,411	2,500	1,411	2,500
Operating loss	(1,734)	(3,426)	(5,205)	(10,278)
Interest income	9	4	12	11
Loss before income taxes	(1,725)	(3,422)	(5,193)	(10,267)
Benefit from income taxes
Net loss	(1,725)	(3,422)	(5,193)	(10,267)
Basic loss per share	$ (0.21)	$ (0.40)	$ (0.62)	$ (1.22)
Cash dividends per share		$ 0.09		$ 0.18
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	113,200	129,943	116,668	137,543
Net loss	(1,725)	(3,422)	(5,193)	(10,267)
Cash dividends paid		(756)		(1,511)
Balance at end of period	$ 111,475	$ 125,765	$ 111,475	$ 125,765