SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

May 31, 2020

Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	2020		2019
Raw materials	$	1,635,000	$	1,208,000
Work in progress		988,000		771,000
Finished products		228,000		172,000
Total	$	2,851,000	$	2,151,000

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2020	2019
Dividend yield	0%	0%
Expected volatility	55.52-72.62%	57.90-60.41%
Risk free interest rate	0.43-1.80%	2.33-2.85%
Expected life	3.75-6.25 years	3.75-6.25 years

Disaggregation of Revenue [Table Text Block]

	Year Ended
	May 31, 2020		May 31, 2019
Clinical Lab	$	2,922,425	$	4,043,993
OTC		1,269,535		868,605
Physicians’ Office		2,194,991		170,871
Contract Manufacturing		305,760		117,213
Total	$	6,692,711	$	5,200,682