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SIGNIFICANT ACCOUNTING POLICIES (Tables)

6 Months Ended

Nov. 30, 2020

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

		November 30, 2020			May 31, 2020
Raw materials		$	1,748,000		$	1,635,000
Work in progress			1,516,000			988,000
Finished products			934,000			228,000
Total		$	4,198,000		$	2,851,000

Share-based Payment Arrangement, Option, Activity [Table Text Block]

		Option Shares		Exercise Price Weighted Average
Outstanding May 31, 2020		1,789,251		$	2.75
Granted		171,000			7.46
Exercised		(30,000)			1.67
Cancelled or expired		(22,001)			3.43
Outstanding November 30, 2020		1,908,250		$	3.18

Disaggregation of Revenue [Table Text Block]

		Six Months Ended						Three Months Ended
		November 30, 2020			November 30, 2019			November 30, 2020			November 30, 2019
Clinical lab		$	1,474,512		$	2,034,228		$	892,804		$	1,144,172
Lab Supplies			2,884			-			2,884			-
OTC			457,131			520,109			272,223			320,785
Physician's office			350,604			124,493			153,273			79,226
Contract Manufacturing			231,201			111,993			51,342			52,225
Total		$	2,516,332		$	2,790,823		$	1,372,526		$	1,596,408

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