INCOME TAXES (Tables)

12 Months Ended

May 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Years ended May 31,	2021		2020
Current:
U.S. Federal	$	-	$	-
Foreign Taxes Subsidiaries		(12,257)		(6,590)
State and local		(800)		(800)
Total current		(13,057)		(7,390)
Deferred:
U.S. Federal		-		-
State and local		-		-
Total deferred		-		-
Income tax expense	$	(13,057)	$	(7,390)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

Years ended May 31,	2021		2020
Computed "expected" tax benefit	$	1,560,971	$	560,656
Increase (reduction) in income taxes resulting from:
Change in valuation allowance		(2,292,366)		(1,152,000)
State income taxes, net of federal benefit		217,559		83,202
Research and development tax credits		456,388		131,461
Permanent tax differences and other		(88,051)		179,042
Stock based compensation benefit		144,699		196,839
Foreign taxes of subsidiaries		(12,257)		(6,590)
Income tax expense	$	(13,057)	$	(7,390)

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

As of May 31,	2021		2020
Deferred tax assets:
Accounts receivable, principally due to allowance for doubtful accounts	$	200,000	$	17,000
Inventory valuation		387,000		16,000
Compensated absences		85,000		64,000
Net operating loss carryforwards		3,194,000		2,286,000
Tax credit carryforwards		1,055,000		599,000
Deferred rent expense/Capitalized leases		15,000		17,000
Stock Options		613,000		304,000
Losses of foreign subsidiaries & Other, net		370,000		304,000
Accumulated depreciation and amortization		(15,000)		5,000
Total deferred tax assets		5,904,000		3,612,000
Less valuation allowance		(5,904,000)		(3,612,000)
Net deferred tax asset	$	-	$	-