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SIGNIFICANT ACCOUNTING POLICIES (Tables)

9 Months Ended

Feb. 28, 2022

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

		February 28, 2022			May 31, 2021
Raw materials		$	1,360,000		$	1,583,000
Work in progress			714,000			1,006,000
Finished products			1,157,000			617,000
Total		$	3,231,000		$	3,206,000

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

		Option Shares		Exercise Price Weighted Average
Outstanding May 31, 2021		2,081,366		$	3.59
Granted		307,000			4.44
Exercised		(23,500)			1.71
Cancelled or expired		(28,750)			3.49
Outstanding February 28, 2022		2,336,116		$	3.72

Disaggregation of Revenue [Table Text Block]

		Three Months Ended February 28,						Nine Months Ended February 28,
		2022			2021			2022			2021
Physician's office		$	6,518,000		$	2,384,000		$	10,134,000		$	2,735,000
Clinical lab			731,000			967,000			2,259,000			2,441,000
Over-the-counter			244,000			148,000			857,000			605,000
Contract manufacturing			167,000			130,000			319,000			364,000
Total		$	7,660,000		$	3,629,000		$	13,569,000		$	6,145,000

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