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Note 4 -Business Segments, Sales of Products and Significant Customers - Schedule of Sales Information by Geographic Area (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | $ 695,267 | $ 724,255 | $ 808,016
Doré and Metals from Doré [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | 211,321 | 255,608 | 313,337
Carbon [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | 4,333 | 2,607 | 4,117
Silver Concentrate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | 356,941 | 329,165 | 345,732
Zinc Concentrate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | 80,274 | 109,177 | 112,448
Precious Metals Concentrate [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | 42,398 | 27,698 | 32,382
UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | 36,307 | 21,938 | 71,278
CANADA |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | 375,092 | 406,600 | 419,090
JAPAN |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | 52,744 | 51,375 | 63,588
KOREA |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | 127,590 | 107,828 | 203,115
CHINA |  |  |
Segment Reporting Information [Line Items] |  |  |
Sales by significant product type | $ 103,534 | $ 136,514 | $ 50,945

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