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Note 6 - Business Segments and Sales of Products - Information About Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Net sales	$ 161,532	$ 143,649	$ 448,321	$ 430,617
Income (loss) from operations	(5,113)	(30,376)	(64,714)	(14,671)
Identifiable assets	2,673,178		2,673,178		$ 2,703,944
Greens Creek [Member]
Net sales	59,015	65,187	194,542	205,642
Income (loss) from operations	17,556	10,705	52,130	59,373
Identifiable assets	648,420		648,420		637,386
Lucky Friday [Member]
Net sales	4,017	(11)	11,150	8,253
Income (loss) from operations	(3,727)	(5,404)	(8,779)	(14,811)
Identifiable assets	438,946		438,946		437,499
Casa Berardi [Member]
Net sales	53,453	52,850	139,015	164,501
Income (loss) from operations	(380)	(1,146)	(26,262)	3,118
Identifiable assets	717,631		717,631		754,248
San Sebastian [Member]
Net sales	15,435	14,129	39,028	40,727
Income (loss) from operations	1,077	(2,381)	(2,358)	2,275
Identifiable assets	50,549		50,549		44,152
Nevada Operations [Member]
Net sales	29,612	11,494	64,586	11,494
Income (loss) from operations	(8,346)	(13,741)	(43,812)	(13,741)
Identifiable assets	558,219		558,219		581,194
Other Segments [Member]
Income (loss) from operations	(11,293)	$ (18,409)	(35,633)	$ (50,885)
Identifiable assets	$ 259,413		$ 259,413		$ 249,465

X

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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.

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