Note 3 - Income and Mining Taxes - Major Components of Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Domestic	$ (270)	$ (446)	$ (1,798)	$ (2,549)
Foreign	(847)	(1,346)	2,021	(3,087)
Total current income and mining tax provision	(1,117)	(1,792)	(3,819)	(5,636)
Domestic	(8,582)	(2,150)	(13,923)	(7,241)
Foreign	4,537	3,688	9,338	6,992
Total deferred income and mining tax provision	(4,045)	1,538	(4,585)	(249)
Total income and mining tax provision	$ (5,162)	$ (254)	$ (8,404)	$ (5,885)