Stock Options And Stock-Based Compensation (Details Narrative) - USD ($)	9 Months Ended
Feb. 28, 2021	Feb. 29, 2020
Share-based Payment Arrangement [Abstract]
Outstanding options	22,500
Weighted average exercise price, outstanding options	$ 1.70
Restricted stock units granted	62,881
Restricted stock unit compensation expense	$ 163,493	$ 326,724
Stock compensation expense related to non-vested restricted stock units	$ 50,048

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Amount of noncash expense for award of restricted stock or unit under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Amount of noncash expense for share-based payment arrangement.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
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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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