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SIGNIFICANT ACCOUNTING POLICIES (Tables)

9 Months Ended

Feb. 28, 2021

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

		February 28, 2021			May 31, 2020
Raw materials		$	1,412,000		$	1,635,000
Work in progress			989,000			988,000
Finished products			459,000			228,000
Total		$	2,860,000		$	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		407,616			6.82
Exercised		(81,750)			1.20
Cancelled or expired		(35,751)			4.26
Outstanding February 28, 2021		2,079,366		$	3.58

Disaggregation of Revenue [Table Text Block]

		Nine Months Ended						Three Months Ended
		February 28, 2021			February 29, 2020			February 28, 2021			February 29, 2020
Clinical lab		$	2,441,000		$	2,769,000		$	967,000		$	723,000
Lab Supplies			3,000			-			-			-
OTC			605,000			778,000			148,000			271,000
Physician's office			2,735,000			157,000			2,384,000			32,000
Contract Manufacturing			361,000			264,000			130,000			151,000
Total		$	6,145,000		$	3,968,000		$	3,629,000		$	1,177,000

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