Note 2 - Business Segments and Sales of Products - Information About Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	$ 245,657	$ 178,131	$ 435,185	$ 377,631
Income from operations	40,600	4,811	45,664	10,364
Interest expense	(12,505)	(10,311)	(25,149)	(20,476)
Fair value adjustments, net	5,002	(2,558)	3,150	623
Net foreign exchange gain (loss)	2,673	(3,850)	6,655	(3,742)
Other income	1,180	1,376	2,692	2,768
Income (loss) before income and mining taxes	36,950	(10,532)	33,012	(10,463)
Identifiable assets	2,939,764		2,939,764		$ 3,011,104
Greens Creek [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	95,659	95,891	192,969	194,502
Income from operations	36,189	30,414	62,405	61,655
Identifiable assets	576,058		576,058		569,369
Lucky Friday [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	59,071	42,648	94,411	91,758
Income from operations	39,312	10,526	62,265	25,096
Identifiable assets	573,484		573,484		578,110
Keno Hill [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	28,950	1,581	39,797	1,581
Income from operations	(3,708)	(9,920)	(12,793)	(16,683)
Identifiable assets	386,141		386,141		362,986
Casa Berardi [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	58,623	36,946	100,207	87,944
Income from operations	(9,717)	(9,366)	(27,712)	(23,059)
Identifiable assets	655,536		655,536		683,035
Other Operating Segment [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Total sales	3,354	1,065	7,801	1,846
Income from operations	(21,476)	$ (16,843)	(38,501)	$ (36,645)
Identifiable assets	$ 748,545		$ 748,545		$ 817,604