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Note 6 - Business Segments and Sales of Products - Sales of Products (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Sales of products	$ 161,532	$ 143,649	$ 448,321	$ 430,617
Less: Smelter and refining charges	(5,351)	(5,530)	(21,609)	(20,530)
Sales by significant product type	160,484	138,627	448,458	422,284
Silver Contracts [Member]
Sales of products	40,588	38,009	122,392	111,656
Doré and Metals from Doré [Member]
Sales by significant product type	87,525	80,074	231,391	227,812
Gold [Member]
Sales of products	103,889	82,628	261,734	233,308
Carbon [Member]
Sales by significant product type	17,745	2,994	27,376	4,273
Lead [Member]
Sales of products	7,114	7,552	22,809	27,469
Lead Concentrate [Member]
Sales by significant product type	37,685	36,728	122,727	113,211
Zinc [Member]
Sales of products	15,292	20,990	62,995	78,714
Zinc Concentrate [Member]
Sales by significant product type	12,345	14,965	51,876	63,197
Bulk Concentrate [Member]
Sales by significant product type	$ 5,184	$ 3,866	$ 15,088	$ 13,791

X

- Definition

Sales revenue goods excluding gain loss on forward contracts.

+ References

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- Definition

The costs of extracting metal from ore.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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