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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands | Feb. 28, 2022 | May 31, 2021
--- | --- | ---
Level 1 |  |
Investment securities | $ 30,584 | $ 580
Level 2 |  |
Investment securities | 0 | 0
Level 3 |  |
Investment securities | 0 | 0
Money Market Fund |  |
Investment securities | 30,584 | 580
Money Market Fund | Level 1 |  |
Investment securities | 30,584 | 580
Money Market Fund | Level 2 |  |
Investment securities | 0 | 0
Money Market Fund | Level 3 |  |
Investment securities | $ 0 | $ 0

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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