Note 5 - Environmental and Reclamation Activities - Schedule of Reclamation and Closure Costs Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Environmental and Reclamation Activities [Abstract]
Beginning balance	$ 120,457	$ 116,999	$ 113,231
Accruals for estimated costs	(239)	2,952	2,874
Accretion expense	5,806	7,740	5,995
Revision of estimated cash flows due to changes in reclamation plans	7,383	(29)	452
Payment of reclamation obligations	(8,497)	(7,205)	(5,553)
Ending balance	$ 124,910	$ 120,457	$ 116,999