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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 9 Months Ended
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Feb. 28, 2022
Accounting Policies [Abstract] |
Schedule of Inventory, Current [Table Text Block] |
|  | February 28, 2022 |  | May 31, 2021
Raw materials |  | $ | 1,360,000 |  | $ | 1,583,000
Work in progress |  |  | 714,000 |  |  | 1,006,000
Finished products |  |  | 1,157,000 |  |  | 617,000
Total |  | $ | 3,231,000 |  | $ | 3,206,000
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  | Option Shares |  | Exercise Price Weighted Average
Outstanding May 31, 2021 |  | 2,081,366 |  | $ | 3.59
Granted |  | 307,000 |  |  | 4.44
Exercised |  | (23,500) |  |  | 1.71
Cancelled or expired |  | (28,750) |  |  | 3.49
Outstanding February 28, 2022 |  | 2,336,116 |  | $ | 3.72
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended February 28, |  | Nine Months Ended February 28,
|  | 2022 |  | 2021 |  | 2022 |  | 2021
Physician's office |  | $ | 6,518,000 |  | $ | 2,384,000 |  | $ | 10,134,000 |  | $ | 2,735,000
Clinical lab |  |  | 731,000 |  |  | 967,000 |  |  | 2,259,000 |  |  | 2,441,000
Over-the-counter |  |  | 244,000 |  |  | 148,000 |  |  | 857,000 |  |  | 605,000
Contract manufacturing |  |  | 167,000 |  |  | 130,000 |  |  | 319,000 |  |  | 364,000
Total |  | $ | 7,660,000 |  | $ | 3,629,000 |  | $ | 13,569,000 |  | $ | 6,145,000

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