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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Domestic	$ (1,182)	$ 253	$ (2,980)	$ (2,296)
Foreign	(1,029)	(1,085)	(3,050)	(4,172)
Total current income and mining tax expense	(2,211)	(832)	(6,030)	(6,468)
Domestic	(3,696)	8,156	(17,619)	915
Foreign	7,407	2,203	16,745	9,195
Total deferred income and mining tax benefit (expense)	3,711	10,359	(874)	10,110
Total income and mining tax benefit (expense)	$ 1,500	$ 9,527	$ (6,904)	$ 3,642