Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) (USD $)	3 Months Ended	9 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014
Income (Loss) Per Share of Common Stock -
Numerator - Net income (loss) available to common shareholders	$ 198,859	$ (213,553)	$ (382,764)	$ 1,084,473
Denominator - Weighted-average shares outstanding - Basic	27,309,812	26,111,201	26,828,417	26,111,201
Denominator - Incremental shares from assumed conversion of options	704,839	0	0	1,441,008
Denominator - Diluted shares	28,014,651	26,111,201	26,828,417	27,552,209
Earnings (Loss) per share - Basic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic
Earnings (Loss) per share - Diluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 0.04us-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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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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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