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Note 3 -Business Segments, Sales of Products and Significant Customers - Schedule of Sales from Continuing Operations to Significant Metals Customers (Details) - Revenue from Contract with Customer Benchmark [Member] - Customer Concentration Risk [Member] | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Customer A [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 35.40% | 37.20% | 32.70%
Customer B [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 23.90% | 21.50% | 16.10%
Customer C [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 11.30% | 21.60% | 13.30%
Customer D [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration Risk, Percentage | 3.50% | 6.20% | 13.90%

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