SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - Revenue from contracts with customers - USD ($)	12 Months Ended
	May 31, 2021	May 31, 2020
Disaggregation of Revenue [Line Items]
Revenue From Customers	$ 7,199,000	$ 6,693,000
Clinical Lab [Member]
Disaggregation of Revenue [Line Items]
Revenue From Customers	3,077,000	2,922,000
Physicians Office [Member]
Disaggregation of Revenue [Line Items]
Revenue From Customers	2,801,000	2,195,000
Over-the-counter [Member]
Disaggregation of Revenue [Line Items]
Revenue From Customers	766,000	1,270,000
Contract Manufacturing [Member]
Disaggregation of Revenue [Line Items]
Revenue From Customers	552,000	$ 306,000
Lab Supplies [Member]
Disaggregation of Revenue [Line Items]
Revenue From Customers	$ 3,000