Note 4 -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
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Customer A [Member]
Segment Reporting Information [Line Items]
Percentage of accounts receivable	24.20%	17.20%	35.40%
Customer B [Member]
Segment Reporting Information [Line Items]
Percentage of accounts receivable	11.80%	28.10%	23.90%
Customer C [Member]
Segment Reporting Information [Line Items]
Percentage of accounts receivable	15.50%	18.50%	11.30%
Customer D [Member]
Segment Reporting Information [Line Items]
Percentage of accounts receivable	9.50%	15.90%	6.90%