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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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May 31, 2018
Accounting Policies [Abstract] |
Schedule of Inventory, Current [Table Text Block] |
| 2018 |  | 2017
Raw materials | $ | 1,000,000 |  | $ | 830,000
Work in progress |  | 854,000 |  |  | 728,000
Finished products |  | 325,000 |  |  | 171,000
Total | $ | 2,179,000 |  | $ | 1,729,000
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| 2018 |  | 2017
Dividend yield |  | 0% |  |  | 0%
Expected volatility |  | 59.8-61.28% |  |  | 53.64-54.73%
Risk free interest rate |  | 1.61-2.53% |  |  | 1.08-1.23%
Expected life |  | 3.75-6.0 years |  |  | 3.75-6.25 years
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
For the Years Ended May 31 | 2018 |  | 2017
Numerator : |  |  |  |  |
Net loss for basic and diluted net loss per common share | $ | (1,465,828) |  | $ | (908,561)
Denominator for basic net loss per common share |  | 8,570,029 |  |  | 8,329,769
Effect of dilutive securities: |  |  |  |  |
Options |  | -- |  |  | --
Denominator for diluted net loss per common share |  | 8,570,029 |  |  | 8,329,769
Basic net loss per common share | $ | (0.17) |  | $ | (0.11)
Diluted net loss per common share | $ | (0.17) |  | $ | (0.11)

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