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The estimated mine life for mining properties.

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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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Amount of allowance for credit loss on accounts receivable.

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

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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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		6 Months Ended
	Jun. 30, 2019 USD ($) T oz	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) T oz	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Number of Reportable Segments			5
Derivative, Gain on Derivative	$ 1,300	$ 2,700		$ 3,300
Derivative, Loss on Derivative			$ 1,200
Accounts Receivable, after Allowance for Credit Loss, Current, Total	6,877		6,877		$ 4,184
Accounts Receivable, Allowance for Credit Loss, Ending Balance	0		0
Employee Labor Strike Related Costs	2,266	$ 6,801	5,044	11,818
Lucky Friday [Member]
Long-Lived Assets	$ 435,900		$ 435,900
Estimated Mine Life			17 years
Lucky Friday [Member] \| Suspension Costs [Member]
Employee Labor Strike Related Costs			$ 3,000	9,400
Lucky Friday [Member] \| Non-cash Depreciation Expense [Member]
Employee Labor Strike Related Costs			$ 2,100	$ 2,400
Silver Contracts [Member]
Metals Contained in Concentrates \| oz	1,700,000		1,700,000
Gold [Member]
Metals Contained in Concentrates \| oz	6,473		6,473
Zinc [Member]
Metals Contained in Concentrates \| T	11,021		11,021
Lead [Member]
Metals Contained in Concentrates \| T	3,142		3,142