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Note 11 - Business Segments and Significant Customers - Percentage of Sales by Segments (Details) - Sales Revenue, Net [Member] | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Percentage of sales | 100.00% | 100.00% | 100.00%
Greens Creek [Member] |  |  |
Percentage of sales | 40.30% | 51.40% | 49.00%
Lucky Friday [Member] |  |  |
Percentage of sales | 14.70% | 14.90% | 17.90%
Casa Berardi [Member] |  |  |
Percentage of sales | 27.40% | 33.70% | 33.10%
San Sebastian [Member] |  |  |
Percentage of sales | 17.60% |  |

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