17. SELECTED QUARTERLY CONSOLIDATED FINANCIAL DATA (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2017	May 31, 2016	May 31, 2015
Selected Quarterly Consolidated Financial Data Details
Net sales	$ 6,683	$ 2,681	$ 4,216	$ 5,318	$ 1,571	$ 1,677	$ 4,620	$ 6,633	$ 18,898	$ 14,501	$ 10,018
Gross profit (loss)	2,608	503	1,463	2,206	(98)	169	1,691	3,383	6,780	5,145	3,838
Net (loss) income	$ (795)	$ (2,651)	$ (1,452)	$ (755)	$ (3,056)	$ (2,975)	$ (1,048)	$ 294	$ (5,653)	$ (6,785)	$ (6,647)
Net (loss) income per share basic and diluted	$ (0.04)	$ (0.16)	$ (0.09)	$ (0.06)	$ (0.23)	$ (0.23)	$ (0.08)	$ 0.02	$ (0.35)	$ (0.52)	$ (0.55)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

No definition available.

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- Definition

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

+ References

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-Publisher FASB
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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