Note 5 - Environmental and Reclamation Activities - Schedule of Reclamation and Closure Costs Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Environmental and Reclamation Activities [Abstract]
Beginning balance	$ 124,910	$ 120,457	$ 116,999
Accruals for estimated costs	75,449	7,144	2,923
Accretion expense	7,331	5,806	7,740
Payment of reclamation obligations	(5,424)	(8,497)	(7,205)
Ending balance	$ 202,266	$ 124,910	$ 120,457