Represents the metals contained in concentrates.

No definition available.

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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- Definition

Amount of allowance for credit loss on accounts receivable.

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- Definition

Amount of increase in the fair value of derivatives recognized in the income statement.

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Amount of decrease in the fair value of derivatives recognized in the income statement.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Note 6 - Business Segments and Sales of Products (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) oz T	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Number of Reportable Segments	5
Derivative, Gain on Derivative	$ 1,700
Derivative, Loss on Derivative		$ 2,500
Accounts Receivable, after Allowance for Credit Loss, Current, Total	$ 6,062		$ 11,952
Accounts Receivable, Allowance for Credit Loss, Ending Balance			$ 0
Silver Contracts [Member]
Metals Contained in Concentrates (Ounce) \| oz	2,100,000
Gold [Member]
Metals Contained in Concentrates (Ounce) \| oz	6,602
Zinc [Member]
Metals Contained in Concentrates (Ounce) \| T	11,376
Lead [Member]
Metals Contained in Concentrates (Ounce) \| T	3,721