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Note 6 - Business Segments and Sales of Products - Percentage of Sales by Segments (Details) - Revenue Benchmark [Member] | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Percentage of sales | 100.00% | 100.00%
Greens Creek [Member] |  |
Percentage of sales | 53.00% | 46.00%
Lucky Friday [Member] |  |
Percentage of sales | 1.00% | 4.00%
Casa Berardi [Member] |  |
Percentage of sales | 26.00% | 40.00%
San Sebastian [Member] |  |
Percentage of sales | 8.00% | 10.00%
Nevada Operations [Member] |  |
Percentage of sales | 12.00% |

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