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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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May 31, 2020
Accounting Policies [Abstract] |
Schedule of Inventory, Current [Table Text Block] |
|  | 2020 |  | 2019
Raw materials |  | $ | 1,635,000 |  | $ | 1,208,000
Work in progress |  |  | 988,000 |  |  | 771,000
Finished products |  |  | 228,000 |  |  | 172,000
Total |  | $ | 2,851,000 |  | $ | 2,151,000
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | 2020 |  | 2019
Dividend yield |  | 0% |  | 0%
Expected volatility |  | 55.52-72.62% |  | 57.90-60.41%
Risk free interest rate |  | 0.43-1.80% |  | 2.33-2.85%
Expected life |  | 3.75-6.25 years |  | 3.75-6.25 years
Disaggregation of Revenue [Table Text Block] |
|  | Year Ended
|  | May 31, 2020 |  | May 31, 2019
Clinical Lab |  | $ | 2,922,425 |  | $ | 4,043,993
OTC |  |  | 1,269,535 |  |  | 868,605
Physicians’ Office |  |  | 2,194,991 |  |  | 170,871
Contract Manufacturing |  |  | 305,760 |  |  | 117,213
Total |  | $ | 6,692,711 |  | $ | 5,200,682

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