Note 2 - Business Segments and Sales of Products - Information About Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	$ 189,528	$ 199,500
Income from operations	5,064	5,553
Interest expense	(12,644)	(10,165)
Fair value adjustments, net	(1,852)	3,181
Net foreign exchange gain	3,982	108
Other income	1,512	1,392
(Loss) income before income and mining taxes	(3,938)	69
Identifiable assets	2,994,258		$ 3,011,104
Greens Creek [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	97,310	98,611
Income from operations	26,216	31,241
Identifiable assets	571,684		569,369
Lucky Friday [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	35,340	49,110
Income from operations	22,953	14,568
Identifiable assets	571,700		578,110
Keno Hill [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	10,847	0
Income from operations	(9,085)	(6,763)
Identifiable assets	374,630		362,986
Casa Berardi [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	41,584	50,998
Income from operations	(17,995)	(13,693)
Identifiable assets	669,626		683,035
Other Segments [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	4,447	781
Income from operations	(17,025)	$ (19,800)
Identifiable assets	$ 806,618		$ 817,604