17. SELECTED QUARTERLY CONSOLIDATED FINANCIAL DATA (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2014	May 31, 2013	May 31, 2012
Selected Quarterly Consolidated Financial Data Details
Net sales	$ 5,370	$ 5,612	$ 4,950	$ 3,752	$ 3,262	$ 3,340	$ 5,054	$ 4,832	$ 19,684	$ 16,488	$ 15,521
Gross profit	2,914	2,870	2,494	1,944	1,292	765	2,263	2,456	10,222	6,776	6,207
Net (loss) income	$ 239	$ 212	$ 137	$ (166)	$ (854)	$ (1,458)	$ (811)	$ (296)	$ 422	$ (3,419)	$ (3,390)
Net (loss) income per share basic and diluted	$ 0.02	$ 0.02	$ 0.01	$ (0.02)	$ (0.08)	$ (0.16)	$ (0.09)	$ (0.03)	$ 0.04	$ (0.36)	$ (0.38)