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Note 11 - Business Segments and Significant Customers - Information About Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sales of products	$ 577,775	$ 645,957	$ 443,567
Income (loss) from operations	64,643	116,944	(35,611)
Capital additions (including non-cash additions)	105,752	181,799	160,716
Depreciation, depletion and amortization	116,062	116,126	112,678
Other significant non-cash items	56,999	15,850	71,204
Identifiable assets	2,364,957	2,371,677	2,221,925
Greens Creek [Member]
Sales of products	278,297	260,446	227,833
Income (loss) from operations	70,132	65,125	26,536
Capital additions (including non-cash additions)	35,255	42,013	45,962
Depreciation, depletion and amortization	56,328	53,222	57,742
Other significant non-cash items	2,685	2,736	2,886
Identifiable assets	671,960	681,303	698,265
Lucky Friday [Member]
Sales of products	21,555	94,479	66,302
Income (loss) from operations	(16,037)	18,175	868
Capital additions (including non-cash additions)	6,268	44,839	60,020
Depreciation, depletion and amortization	2,447	11,810	11,262
Other significant non-cash items	2,011	720	72
Identifiable assets	432,400	442,829	393,338
Casa Berardi [Member]
Sales of products	192,165	177,143	149,432
Income (loss) from operations	4,003	16,336	(1,557)
Capital additions (including non-cash additions)	51,327	67,577	35,302
Depreciation, depletion and amortization	54,594	47,312	43,674
Other significant non-cash items	653	1,259	2,229
Identifiable assets	804,505	806,044	779,423
San Sebastian [Member]
Sales of products	85,758	113,889
Income (loss) from operations	53,591	77,221	(9,269)
Capital additions (including non-cash additions)	9,994	6,026	4,623
Depreciation, depletion and amortization	2,693	3,782
Other significant non-cash items	468		13
Identifiable assets	62,198	33,608	22,238
Other Segments [Member]
Income (loss) from operations	(47,046)	(59,913)	(52,189)
Capital additions (including non-cash additions)	2,908	21,344	14,809
Other significant non-cash items	51,182	11,135	66,004
Identifiable assets	$ 393,894	$ 407,893	$ 328,661

X

- Definition

Amount of income (expense) included in net income that results in no cash inflow (outflow) attributable to noncash items not otherwise classifed, excluding depreciation, depletion, and amortization

+ References

No definition available.

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- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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X

- Definition

Aggregate depreciation, depletion and amortization expense in the current period for the cost of tangible assets, intangible assets, or depleting assets directly related to goods produced and sold during the reporting period.

+ References

No definition available.

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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X

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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