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Note 7 - Business Segments and Sales of Products - Percentage of Sales by Segments (Details) - Sales Revenue, Net [Member] | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Percentage of sales | 100.00% | 100.00% | 100.00% | 100.00%
Greens Creek [Member] |  |  |  |
Percentage of sales | 45.00% | 43.00% | 48.00% | 46.00%
Lucky Friday [Member] |  |  |  |
Percentage of sales |  |  | 2.00% | 5.00%
Casa Berardi [Member] |  |  |  |
Percentage of sales | 37.00% | 38.00% | 39.00% | 33.00%
San Sebastian [Member] |  |  |  |
Percentage of sales | 10.00% | 19.00% | 9.00% | 16.00%
Nevada Operations [Member] |  |  |  |
Percentage of sales | 8.00% |  | 2.00% |

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