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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.

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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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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Amount of unrecognized tax benefits.

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7. INCOME TAXES (Details Narrative) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018	May 31, 2017
Valuation allowance	$ (118)	$ 813	$ (6,139)
Unrecognized tax benefits	1,852	$ 1,809	1,785	$ 789
Federal refundable AMT credit			$ 91
Federal
Net operating loss carryforward	54,601
Indefinite tax credit carryforwards	3,700
Research and development tax credit carryforwards	2,026
State
Net operating loss carryforward	29,386
Research and development tax credit carryforwards	5,825
Alternative minimum tax credit carryforwards	34
Foreign
Net operating loss carryforward	$ 378