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Note 12 - Business Segments, Sales of Products and Significant Customers - Percentage of Sales by Segments (Details) - Sales Revenue, Net [Member] | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Percentage of sales | 100.00% | 100.00% | 100.00%
Greens Creek [Member] |  |  |
Percentage of sales | 46.70% | 48.10% | 40.30%
Lucky Friday [Member] |  |  |
Percentage of sales | 1.80% | 3.80% | 14.70%
Casa Berardi [Member] |  |  |
Percentage of sales | 37.10% | 33.30% | 27.40%
San Sebastian [Member] |  |  |
Percentage of sales | 8.90% | 14.80% | 17.60%
Nevada Operations [Member] |  |  |
Percentage of sales | 5.50% |  |

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