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Note 6 - Business Segments and Sales of Products - Percentage of Sales by Segments (Details) - Revenue Benchmark [Member] | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Percentage of sales | 100.00% | 100.00% | 100.00% | 100.00%
Greens Creek [Member] |  |  |  |
Percentage of sales | 47.00% | 37.00% | 46.00% | 44.00%
Lucky Friday [Member] |  |  |  |
Percentage of sales | 10.00% | 2.00% | 7.00% | 2.00%
Casa Berardi [Member] |  |  |  |
Percentage of sales | 27.00% | 33.00% | 30.00% | 31.00%
San Sebastian [Member] |  |  |  |
Percentage of sales | 5.00% | 10.00% | 5.00% | 9.00%
Nevada Operations [Member] |  |  |  |
Percentage of sales | 11.00% | 18.00% | 12.00% | 14.00%

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