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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 12 Months Ended
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May 31, 2021
Accounting Policies [Abstract] |
Schedule of Inventory, Current [Table Text Block] |
|  | May 31, 2021 |  | May 31, 2020
Raw materials |  | $ | 1,583,000 |  | $ | 1,635,000
Work in progress |  |  | 1,006,000 |  |  | 988,000
Finished products |  |  | 617,000 |  |  | 228,000
Total |  | $ | 3,206,000 |  | $ | 2,851,000
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  |  | 2021 |  |  | 2020
Dividend yield |  |  | 0% |  |  | 0%
Expected volatility |  |  | 71.19-107.53% |  |  | 55.52-72.62%
Risk free interest rate |  |  | 0.34-1.18% |  |  | 0.43-1.80%
Expected Term |  |  | 5.50-6.25 Years |  |  | 3.75-6.25 Years
Disaggregation of Revenue [Table Text Block] |
|  | Year Ended
|  | May 31, 2021 |  | May 31, 2020
Clinical lab |  | $ | 3,077,000 |  | $ | 2,922,000
Physician's office |  |  | 2,801,000 |  |  | 2,195,000
Over-the-counter |  |  | 766,000 |  |  | 1,270,000
Contract manufacturing |  |  | 552,000 |  |  | 306,000
Lab supplies |  |  | 3,000 |  |  | -
Total |  | $ | 7,199,000 |  | $ | 6,693,000

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