SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Aug. 31, 2020

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	August 31,2020		May 31,2020
Raw materials	$	2,219,000	$	1,635,000
Work in progress		890,000		988,000
Finished products		992,000		228,000
Total	$	4,101,000	$	2,851,000

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

		Exercise Price Weighted Average
	Option Shares
Outstanding May 31, 2020	1,789,251	$	2.75
Granted	171,000		7.46
Exercised	(12,500)		1.20
Cancelled or expired	(22,001)		3.43
Outstanding August 31, 2020	1,925,750	$	3.17

Disaggregation of Revenue [Table Text Block]

	Three Months Ended
	August 31,2020		August 31,2019
Clinical lab	$	581,708	$	890,152
OTC		184,908		199,209
Physician's office		197,331		45,222
Contract Manufacturing		179,859		59,832
Total	$	1,143,806	$	1,194,415