3. EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Earnings Per Share [Abstract]
Numerator: Net (loss) income	$ (1,726)us-gaap_NetIncomeLoss	$ 212us-gaap_NetIncomeLoss	$ (4,747)us-gaap_NetIncomeLoss	$ 183us-gaap_NetIncomeLoss
Denominator for basic net (loss) income per share: Weighted average shares outstanding (in thousands)	12,677	10,982	11,931	10,807
Shares used in basic net (loss) income per share calculation (in thousands)	12,677	10,982	11,931	10,807
Effect of dilutive securities (in thousands)	0	1,295	0	776
Denominator for diluted net (loss) income per share (in thousands)	12,677	12,277	11,931	11,583
Basic net (loss) income per share	$ (0.14)us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ (0.40)us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic
Diluted net (loss) income per share	$ (0.14)us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ (0.40)us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (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.

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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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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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