2. Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)	Feb. 28, 2019	May 31, 2018	Feb. 28, 2018	May 31, 2017
Cash and cash equivalents:
Cash	$ 53,051	$ 31,622
Money market funds	713,110	1,265,505
Certificates of deposit	1,000,000	1,000,763
Restricted cash and cash equivalents	198,887	21,559	$ 21,524	$ 21,443
Total	1,965,048	2,319,449
Fair Value Inputs Level 1 [Member]
Cash and cash equivalents:
Cash	53,051	31,622
Money market funds	713,110	1,265,505
Certificates of deposit	0	0
Restricted cash and cash equivalents	198,887	21,559
Total	865,048	1,318,686
Fair Value Inputs Level 2 [Member]
Cash and cash equivalents:
Cash	0	0
Money market funds	0	0
Certificates of deposit	1,000,000	1,000,763
Restricted cash and cash equivalents	0	0
Total	1,000,000	1,000,763
Fair Value Inputs Level 3 [Member]
Cash and cash equivalents:
Cash	0	0
Money market funds	0	0
Certificates of deposit	0	0
Restricted cash and cash equivalents	0	0
Total	$ 0	$ 0

Cash and cash equivalents:

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

No definition available.

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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

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- Definition

Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

No definition available.

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- Definition

Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Publisher FASB
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