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SIGNIFICANT ACCOUNTING POLICIES (Tables) | 6 Months Ended
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Nov. 30, 2021
Accounting Policies [Abstract] |
Schedule of Inventory, Current [Table Text Block] |
|  | November 30, 2021 |  | May 31, 2021
Raw materials |  | $ | 1,416,000 |  | $ | 1,583,000
Work in progress |  |  | 708,000 |  |  | 1,006,000
Finished products |  |  | 858,000 |  |  | 617,000
Total |  | $ | 2,982,000 |  | $ | 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 |  | 24,000 |  |  | 4.25
Exercised |  | (21,500) |  |  | 1.64
Cancelled or expired |  | (24,750) |  |  | 3.24
Outstanding November 30, 2021 |  | 2,059,116 |  | $ | 3.62
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended November 30, |  | Six Months Ended November 30,
|  | 2021 |  | 2020 |  | 2021 |  | 2020
Physician's office |  | $ | 3,359,000 |  | $ | 153,000 |  | $ | 3,616,000 |  | $ | 351,000
Clinical lab |  |  | 642,000 |  |  | 893,000 |  |  | 1,528,000 |  |  | 1,475,000
Over-the-counter |  |  | 534,000 |  |  | 272,000 |  |  | 613,000 |  |  | 457,000
Contract manufacturing |  |  | 112,000 |  |  | 55,000 |  |  | 152,000 |  |  | 233,000
Total |  | $ | 4,647,000 |  | $ | 1,373,000 |  | $ | 5,909,000 |  | $ | 2,516,000

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