11. CAPITAL STOCK (Details 1) $ / shares in Units, $ in Thousands	12 Months Ended
May 31, 2017 USD ($) $ / shares shares
Options exercisable and expected to be exercisable \| shares	2,422,000
Weighted Average Exercise Price Exercisable \| $ / shares	$ 3.21
$0.59-$0.97
Number of Options Outstanding, Ending \| shares	514
Weighted Average Remaining Contractual Life (Years) Options Outstanding	1 year 9 months 7 days
Weighted Average Exercise Price Outstanding, Ending \| $ / shares	$ 0.66
Options exercisable and expected to be exercisable \| shares	514
Weighted Average Remaining Contractual Life (Years) Options Exercisable	1 year 9 months 7 days
Weighted Average Exercise Price Exercisable \| $ / shares	$ 0.66
$1.09-$1.40
Number of Options Outstanding, Ending \| shares	784
Weighted Average Remaining Contractual Life (Years) Options Outstanding	2 years 4 months 28 days
Weighted Average Exercise Price Outstanding, Ending \| $ / shares	$ 1.28
Options exercisable and expected to be exercisable \| shares	773
Weighted Average Remaining Contractual Life (Years) Options Exercisable	2 years 4 months 24 days
Weighted Average Exercise Price Exercisable \| $ / shares	$ 1.28
$1.68-$2.06
Number of Options Outstanding, Ending \| shares	542
Weighted Average Remaining Contractual Life (Years) Options Outstanding	5 years 1 month 13 days
Weighted Average Exercise Price Outstanding, Ending \| $ / shares	$ 1.77
Options exercisable and expected to be exercisable \| shares	287
Weighted Average Remaining Contractual Life (Years) Options Exercisable	4 years 3 months 4 days
Weighted Average Exercise Price Exercisable \| $ / shares	$ 1.85
$2.10-$2.81
Number of Options Outstanding, Ending \| shares	1,234
Weighted Average Remaining Contractual Life (Years) Options Outstanding	4 years 6 months 11 days
Weighted Average Exercise Price Outstanding, Ending \| $ / shares	$ 2.44
Options exercisable and expected to be exercisable \| shares	848
Weighted Average Remaining Contractual Life (Years) Options Exercisable	4 years 5 months 16 days
Weighted Average Exercise Price Exercisable \| $ / shares	$ 2.46
$0.59-$2.81
Number of Options Outstanding, Ending \| shares	3,074
Weighted Average Remaining Contractual Life (Years) Options Outstanding	3 years 7 months 17 days
Weighted Average Exercise Price Outstanding, Ending \| $ / shares	$ 1.73
Options exercisable and expected to be exercisable \| shares	2,422
Weighted Average Remaining Contractual Life (Years) Options Exercisable	3 years 2 months 16 days
Weighted Average Exercise Price Exercisable \| $ / shares	$ 1.63
Aggregate Intrinsic Value \| $	$ 7,148

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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