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Significant Accounting Policies (Details) - Options Activity	3 Months Ended
	Aug. 31, 2018 $ / shares shares
Options Activity [Abstract]
Option Outstanding, Share | shares	1,138,625
Option Outstanding, Exercise Price Weighted Average | $ / shares	$ 1.65
Option Granted, Shares | shares
Option Granted, Exercise Price Weighted Average | $ / shares
Option Forfeited, Shares | shares	(3,500)
Option Forfeited, Exercise Price Weighted Average | $ / shares	$ 0.99
Option Exercised, Shares | shares	(21,500)
Option Exercised, Exercise Price Weighted Average | $ / shares	$ 0.83
Option Outstanding, Shares | shares	1,113,625
Option Outstanding, Exercise Price Weighted Average | $ / shares	$ 1.67

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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Gross number of share options (or share units) granted during the period.

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

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

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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