Summary of Significant Accounting Pronouncements (Narrative) (Details) - USD ($)	12 Months Ended
May 31, 2019	May 31, 2018
Income tax examination, penalties and interest expense	$ 0	$ 1,991

The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

Name:	us-gaap_IncomeTaxExaminationPenaltiesAndInterestExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration