7. INCOME TAXES (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
May 31, 2021	May 31, 2020	May 31, 2019
Valuation allowance	$ 2,438	$ (118)	$ 813
Federal
Net operating loss carryforward	(64,298)	(54,601)
Indefinite tax credit carryforwards	(13,383)
Research and development tax credit carryforwards	2,201	2,113
State
Net operating loss carryforward	(29,812)	(29,386)
Research and development tax credit carryforwards	5,955	$ 5,782
Alternative minimum tax credit carryforwards	$ 34

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

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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
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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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