Consolidated Statements of Operations and Retained Earnings (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
OPERATIONS:
Net sales	$ 48,994	$ 49,920
Cost of sales	44,665	46,861
Gross profit	4,329	3,059
Selling and administrative expenses	5,733	6,530
Operating loss	(1,404)	(3,471)
Interest income	25	3
Loss before income taxes	(1,379)	(3,468)
Benefit from income taxes
Net loss	(1,379)	(3,468)
Basic loss per share	$ (0.16)	$ (0.41)
Weighted average number of common shares outstanding	8,391,244	8,391,244
RETAINED EARNINGS:
Balance at beginning of period	106,155	116,668
Net loss	(1,379)	(3,468)
Balance at end of period	$ 104,776	$ 113,200