INCOME TAXES (Details Narrative) - USD ($)	12 Months Ended
May 31, 2022	May 31, 2021	May 31, 2020
Valuation allowance	$ (278,000)	$ 2,438,000	$ (118,000)
Federal
Net operating loss carryforward	(61,068,000)	(64,298,000)
Indefinite tax credit carryforwards	14,425,000
Research and development tax credit carryforwards	2,362,000	2,201,000
State
Net operating loss carryforward	(30,043,000)	(29,812,000)
Research and development tax credit carryforwards	6,152,000	$ 5,955,000
Alternative minimum tax credit carryforwards	$ 34,000

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 6
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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