Note 5 - Intangible Assets (Details Textual) - USD ($) $ in Thousands	Nov. 30, 2022	May 31, 2022
Licenses, Permits and Applications [Member]
Indefinite-Lived Intangible Assets (Excluding Goodwill), Ending Balance	$ 235,391	$ 248,411

Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Name:	us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant