18. Fair Value of Financial Instruments:	12 Months Ended
May 31, 2022
Accounting Policies [Abstract]
18. Fair Value of Financial Instruments:	18. Fair Value of Financial Instruments: The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable, and accrued liabilities approximate fair value because of the short maturity of these instruments. The fair values of short-term investments were determined as described in Note 1.

Disclosure of accounting policy for determining the fair value of financial instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 60
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=7493716&loc=d3e21868-110260

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13279-108611

Name:	us-gaap_FairValueOfFinancialInstrumentsPolicy
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration