Note 4 -Business Segments, Sales of Products and Significant Customers - Schedule of Sales of Products by Metal (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Less: Smelter and refining charges	$ (41,273)	$ (50,909)	$ (51,973)
Total consolidated sales	929,925	720,227	718,905
Silver Contracts [Member]
Segment Reporting Information [Line Items]
Total consolidated sales	413,980	302,284	265,054
Gold [Member]
Segment Reporting Information [Line Items]
Total consolidated sales	318,256	274,613	298,910
Lead [Member]
Segment Reporting Information [Line Items]
Total consolidated sales	87,223	72,726	83,384
Zinc [Member]
Segment Reporting Information [Line Items]
Total consolidated sales	130,767	116,230	123,057
Copper [Member]
Segment Reporting Information [Line Items]
Total consolidated sales	416	0	0
Total Metal [Member]
Segment Reporting Information [Line Items]
Total consolidated sales	909,369	714,944	718,432
Environmental Remediation Services [Member]
Segment Reporting Information [Line Items]
Total consolidated sales	$ 20,556	$ 5,283	$ 473