Note 3 - Liquidity (Details Textual) - The Joint Venture Company [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Schedule Of Liquidity [Line Items]
Exploration Budget, Funded Amount	$ 62.7	$ 62.7
Exploration budget funded amount for next fiscal year	27.2
Exploration budget amount funded by the company for next fiscal year	15.5
Capital availability under facility to reach production	22.5
Repayment obligations on the facility	29.9
Secured Credit Facility [Member]
Schedule Of Liquidity [Line Items]
Exploration Budget, Funded Amount	$ 42.5