Note 3 - Liquidity (Details Textual) - The Joint Venture Company [Member] - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jul. 31, 2024	Jun. 30, 2024
Schedule Of Liquidity [Line Items]
Exploration Budget, Funded Amount		$ 74.5
Exploration budget funded amount for next fiscal year		31.3
Exploration budget amount funded by the company for next fiscal year		27.2
Capital availability under facility to reach production		5.0
Repayment obligations on the facility		29.9
Subsequent Event [Member]
Schedule Of Liquidity [Line Items]
Exploration Budget, Funded Amount	$ 78.6
Remaining equity method investment entity shares of exploration budget funded amount	4.1
Principal payment	$ 2.0
Secured Credit Facility [Member]
Schedule Of Liquidity [Line Items]
Exploration Budget, Funded Amount		$ 60.0