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v3.21.2

SUBSEQUENT EVENTS (Details) - Subsequent Event [Member] | 3 Months Ended
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Aug. 31, 2021 USD ($) $ / shares shares
SUBSEQUENT EVENTS (Details) [Line Items] |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | shares | 1,500
Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price | $ / shares | $ 2.68
Proceeds from Stock Options Exercised | $ | $ 4,000
Stock Issued During Period, Shares, New Issues | shares | 201,553
Share Price | $ / shares | $ 4.16
Proceeds from Issuance of Common Stock | $ | $ 824,000

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