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SIGNIFICANT ACCOUNTING POLICIES (Details) - Revenue from contracts with customers - USD ($)
3 Months Ended 9 Months Ended
Feb. 28, 2022
Feb. 28, 2021
Feb. 28, 2022
Feb. 28, 2021
Disaggregation of Revenue [Line Items]        
Revenue From Customers $ 7,660,000 $ 3,629,000 $ 13,569,000 $ 6,145,000
Physicians Office [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Customers 6,518,000 2,384,000 10,134,000 2,735,000
Clinical Lab [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Customers 731,000 967,000 2,259,000 2,441,000
Over the counter [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Customers 244,000 148,000 857,000 605,000
Contract Manufacturing [Member]        
Disaggregation of Revenue [Line Items]        
Revenue From Customers $ 167,000 $ 130,000 $ 319,000 $ 364,000