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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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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
	Mar. 31, 2019 USD ($) oz T	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Number of Reportable Segments	5
Derivative, Loss on Derivative	$ 2,500
Derivative, Gain on Derivative		$ 600
Accounts Receivable, after Allowance for Credit Loss, Current, Total	9,586		$ 4,184
Accounts Receivable, Allowance for Credit Loss, Ending Balance	0		$ 0
Employee Labor Strike Related Costs	2,778	5,017
Lucky Friday [Member]
Long-Lived Assets	$ 435,900
Estimated Mine Life	17 years
Lucky Friday [Member] \| Suspension Costs [Member]
Employee Labor Strike Related Costs	$ 1,900	4,100
Lucky Friday [Member] \| Non-cash Depreciation Expense [Member]
Employee Labor Strike Related Costs	$ 900	$ 900
Silver [Member]
Metals Contained in Concentrates \| oz	900,000
Gold [Member]
Metals Contained in Concentrates \| oz	4,096
Zinc [Member]
Metals Contained in Concentrates \| T	11,108
Lead [Member]
Metals Contained in Concentrates \| T	1,814