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INCOME TAXES (Details 4) - USD ($) $ in Thousands | 12 Months Ended
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May 31, 2022 | May 31, 2021 | May 31, 2020
INCOME TAXES (Details 4) |  |  |
Unrecognized tax benefit, beginning | $ 1,928 | $ 1,852 | $ 1,809
Decreases related to prior year tax positions |  |  | (11)
Increases related to prior year tax positions | 12 | 11 |
Increases related to current year tax positions | 78 | 65 | 54
Unrecognized tax benefit, ending | $ 2,018 | $ 1,928 | $ 1,852

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI https://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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