Note 7 - Equity-accounted Investment (Details Textual) - Uranium Royalty Corp [Member]	9 Months Ended
Apr. 30, 2019 USD ($) shares
Equity Method Investment, Shares Owned	14,000,000
Equity Method Investment, Ownership Percentage	33.70%
Royalty Purchase Agreement [Member]
Number Of Shares Acquired Through Sale Of Royalties	12,000,000
Consideration Shares, Fair Value \| $	$ 9,077,842

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant