Note 3 - Income and Mining Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Domestic	$ 253	$ (2,176)	$ (2,296)	$ (7,489)
Foreign	(1,085)	(1,578)	(4,172)	(4,690)
Total current income and mining tax provision	(832)	(3,754)	(6,468)	(12,179)
Domestic	8,156	3,213	915	8,226
Foreign	2,203	5,074	9,195	7,877
Total deferred income and mining tax benefit	10,359	8,287	10,110	16,103
Total income and mining tax benefit (provision)	$ 9,527	$ 4,533	$ 3,642	$ 3,924