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Note 4- Business Segments, Sales of Products and Significant Customers - Sales from Continuing Operations to Significant Metals Customers As a Percentage of Total Sales (Details) - Customer Concentration Risk [Member] - Revenue from Contract with Customer Benchmark [Member] | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
CIBC [Member] |  |  |
Significant metal customers | 37.20% | 32.70% | 23.10%
Teck Metals Ltd [Member] |  |  |
Significant metal customers | 21.50% | 16.10% | 8.20%
Ocean Partners [Member] |  |  |
Significant metal customers | 6.20% | 13.90% | 5.70%
Korea Zinc [Member] |  |  |
Significant metal customers | 21.60% | 13.30% | 17.40%
Scotia [Member] |  |  |
Significant metal customers | 0.00% | 2.90% | 24.00%

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