INTANGIBLE ASSETS, NET

12 Months Ended

May 31, 2017

Disclosure Text Block [Abstract]

Intangible Assets Disclosure [Text Block]

3.    INTANGIBLE ASSETS, NET

Intangible assets, net of accumulated amortization, consist of the following at May 31:

		2017		2016
Patents and licenses	$	509,485	$	509,485
Less accumulated amortization		(335,016)		(260,684)
	$	174,469	$	248,801

Expected amortization of intangible assets for the years ending May 31:

2018	$	70,333
2019		64,362
2020		20,898
2021		13,286
2022		3,864
Thereafter		1,726
Total	$	174,469