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Note 6 - Business Segments and Sales of Products - Percentage of Sales by Segments (Details) - Sales Revenue, Net [Member] | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Percentage of sales | 100.00% | 100.00%
Greens Creek [Member] |  |
Percentage of sales | 46.00% | 41.00%
Lucky Friday [Member] |  |
Percentage of sales | 4.00% | 14.00%
Casa Berardi [Member] |  |
Percentage of sales | 40.00% | 29.00%
San Sebastian [Member] |  |
Percentage of sales | 10.00% | 16.00%

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