Note 3 -Business Segments, Sales of Products and Significant Customers - Schedule of Sales of Products by Metal (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Less: Smelter and refining charges	$ (51,973)	$ (48,933)	$ (68,361)
Net sales	718,905	807,473	691,873
Sales of products	718,432	807,473	691,873
Silver Contracts [Member]
Segment Reporting Information [Line Items]
Net sales	265,054	293,646	260,227
Gold [Member]
Segment Reporting Information [Line Items]
Net sales	298,910	362,037	356,166
Lead [Member]
Segment Reporting Information [Line Items]
Net sales	83,384	75,431	48,776
Zinc [Member]
Segment Reporting Information [Line Items]
Net sales	$ 123,057	$ 125,292	$ 95,065