Note 1 - Nature of Operations (Details Textual)	Jun. 08, 2021 USD ($) lb	Apr. 30, 2021 USD ($) lb	Jul. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)
Working Capital (Deficit)		$ 64,200,000
Cash and Cash Equivalents, at Carrying Value, Ending Balance		43,930,316	$ 5,147,703	$ 7,407,189
Available-for-sale Securities, Current, Total		4,000,000
Inventory, Net, Total		26,405,480	$ 211,662
Long-Term Debt, Maturity, Year One		10,000,000
Uranium Inventory [Member]
Inventory, Net, Total		$ 26,200,000
Purchase Obligation, Mass (Pound) | lb		1,405,000
Purchase Obligation, Total		$ 43,484,000
Purchase Obligation, to be Paid, Year One		$ 18,065,000
Uranium Inventory [Member] | Subsequent Event [Member]
Purchase Obligation, Mass (Pound) | lb	2,505,000
Purchase Obligation, Total	$ 75,900,000
Purchase Obligation, to be Paid, Year One	$ 18,100,000