SIGNIFICANT ACCOUNTING POLICIES (Details) - Revenue from contracts with customers - USD ($)	3 Months Ended
	Aug. 31, 2021	Aug. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue From Customers	$ 1,262,000	$ 1,144,000
Clinical Lab [Member]
Disaggregation of Revenue [Line Items]
Revenue From Customers	886,000	582,000
Physicians Office [Member]
Disaggregation of Revenue [Line Items]
Revenue From Customers	257,000	197,000
Over-the-counter [Member]
Disaggregation of Revenue [Line Items]
Revenue From Customers	79,000	185,000
Contract Manufacturing [Member]
Disaggregation of Revenue [Line Items]
Revenue From Customers	$ 40,000	$ 180,000