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Note 6 - Business Segments and Sales of Products (Details Textual) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) oz	Sep. 30, 2019 USD ($) oz	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) oz	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Number of Reportable Segments				5
Derivative, Gain on Derivative		$ 1,100		$ 5,000	$ 8,300
Derivative, Loss on Derivative			$ 100
Accounts Receivable, after Allowance for Credit Loss, Current, Total	$ 6,222	6,222		6,222		$ 4,184
Accounts Receivable, Allowance for Credit Loss, Ending Balance						0
Contract with Customer, Liability, Current	20,084	20,084		20,084		$ 0
Cost of Goods and Services Sold, Total		146,652	137,073	450,240	350,253
Depreciation, Depletion and Amortization, Total				143,040	108,814
Employee Labor Strike Related Costs		3,722	$ 6,519	8,766	18,337
Greens Creek [Member]
Proceeds from Customers	20,100
Contract with Customer, Liability, Current	20,100	20,100		20,100
Cost of Goods and Services Sold, Total	9,200
Depreciation, Depletion and Amortization, Total	2,600
Lucky Friday [Member]
Long-Lived Assets	$ 437,000	$ 437,000		$ 437,000
Estimated Mine Life				17 years
Lucky Friday [Member] | Suspension Costs [Member]
Employee Labor Strike Related Costs				$ 5,700	13,500
Lucky Friday [Member] | Non-cash Depreciation Expense [Member]
Employee Labor Strike Related Costs				$ 3,100	$ 3,700
Silver Contracts [Member]
Metals Contained in Concentrates | oz	2,900,000	2,900,000		2,900,000
Gold [Member]
Metals Contained in Concentrates | oz	8,831	8,831		8,831
Zinc [Member]
Metals Contained in Concentrates | oz	10,737	10,737		10,737
Lead [Member]
Metals Contained in Concentrates | oz	6,344	6,344		6,344

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Amount of expenses associated with a labor strike by a portion of the reporting entity's workforce.

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