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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($) | Feb. 28, 2023 | May 31, 2022
--- | --- | ---
Money Market Funds [Member] |  |
Investment securities | $ 11,876,000 | $ 28,609,000
Level 1 [Member] | Money Market Funds [Member] |  |
Investment securities | 11,876,000 | 28,609,000
Level 1 [Member] | US Treasury Securities [Member] |  |
Investment securities | 29,560,000 |
Level 2 [Member] | Money Market Funds [Member] |  |
Investment securities | 0 | 0
Level 2 [Member] | US Treasury Securities [Member] |  |
Investment securities | 0 |
Level 3 [Member] | Money Market Funds [Member] |  |
Investment securities | 0 | $ 0
Level 3 [Member] | US Treasury Securities [Member] |  |
Investment securities | 0 |
Assets [Member] |  |
Investment securities | 41,436,000 |
Assets [Member] | Level 1 [Member] |  |
Investment securities | 41,436,000 |
Assets [Member] | Level 2 [Member] |  |
Investment securities | 0 |
Assets [Member] | Level 3 [Member] |  |
Investment securities | 0 |
U.S. treasury securities [Member] |  |
Investment securities | $ 29,560,000 |

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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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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