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Note 14 - Guarantor Subsidiaries - Unaudited Interim Condensed Consolidating Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues	$ 161,532	$ 143,649	$ 448,321	$ 430,617
Cost of sales	(95,878)	(93,609)	(311,202)	(246,918)
Depreciation, depletion, amortization	(50,774)	(43,464)	(139,038)	(103,335)
General and administrative	(7,978)	(10,327)	(26,855)	(27,849)
Exploration and pre-development	(5,689)	(13,606)	(16,091)	(31,224)
Research and development	(53)	(1,269)	(614)	(5,042)
Gain (loss) on derivative contracts	(4,718)	19,460	(2,719)	40,271
Foreign exchange gain (loss)	773	(2,212)	(6,741)	2,856
Lucky Friday suspension-related costs	(3,722)
Acquisition costs	(183)	(6,139)	(593)	(9,656)
Equity in earnings of subsidiaries	0	0	0	0
Other (expense) income	(14,440)	(11,827)	(47,292)	(35,737)
Income (loss) before income taxes	(21,130)	(25,863)	(111,590)	(4,354)
(Provision) benefit from income taxes	1,614	2,679	20,009	1,484
Net income (loss)	(19,516)	(23,184)	(91,581)	(2,870)
Series B Preferred Stock dividends declared	(138)	(138)	(414)	(414)
Income (loss) applicable to common shareholders	(19,654)	(23,322)	(91,995)	(3,284)
Changes in comprehensive income (loss)	(3,288)	3,746	4,511	(3,521)
Comprehensive income (loss)	(22,804)	(19,438)	(87,070)	(6,390)
Revenues	161,532	143,649	448,321	430,617
Lucky Friday suspension-related costs	(3,722)	(6,519)	(8,766)	(18,337)
Reportable Legal Entities [Member] | Parent Company [Member]
Revenues	1,049	5,020	(136)	8,332
Cost of sales	(472)	(157)	(1,190)	245
Depreciation, depletion, amortization	0	0	0	0
General and administrative	(2,951)	(4,802)	(12,110)	(13,250)
Exploration and pre-development	(3)	(1)	(22)	(128)
Research and development	0	0	0	0
Gain (loss) on derivative contracts	(4,718)	19,460	(2,719)	40,271
Foreign exchange gain (loss)	(3,201)	4,640	7,820	(9,795)
Lucky Friday suspension-related costs	0
Acquisition costs	(100)	(5,741)	(221)	(9,041)
Equity in earnings of subsidiaries	(6,761)	(54,618)	(77,563)	(31,105)
Other (expense) income	(2,359)	13,016	(5,438)	11,602
Income (loss) before income taxes	(19,516)	(23,183)	(91,579)	(2,869)
(Provision) benefit from income taxes	0	(1)	(2)	(1)
Net income (loss)	(19,516)	(23,184)	(91,581)	(2,870)
Series B Preferred Stock dividends declared	(138)	(138)	(414)	(414)
Income (loss) applicable to common shareholders	(19,654)	(23,322)	(91,995)	(3,284)
Changes in comprehensive income (loss)	(3,288)	3,746	4,511	(3,520)
Comprehensive income (loss)	(22,804)	(19,438)	(87,070)	(6,390)
Revenues	1,049	5,020	(136)	8,332
Lucky Friday suspension-related costs		0	0	0
Reportable Legal Entities [Member] | Guarantor Subsidiaries [Member]
Revenues	144,999	124,497	409,339	381,556
Cost of sales	(85,829)	(80,876)	(280,397)	(219,497)
Depreciation, depletion, amortization	(47,448)	(41,669)	(132,104)	(99,749)
General and administrative	(4,722)	(5,082)	(13,571)	(13,247)
Exploration and pre-development	(4,315)	(11,227)	(10,645)	(22,571)
Research and development	37	(732)	(521)	(3,702)
Gain (loss) on derivative contracts	0	0	0	0
Foreign exchange gain (loss)	5,129	(7,629)	(14,636)	12,230
Lucky Friday suspension-related costs	(3,722)
Acquisition costs	(83)	(386)	(219)	(454)
Equity in earnings of subsidiaries	0	0	0	0
Other (expense) income	(9,930)	(4,756)	(31,573)	(19,034)
Income (loss) before income taxes	(5,884)	(34,379)	(83,093)	(2,805)
(Provision) benefit from income taxes	(625)	(17,530)	6,864	(26,348)
Net income (loss)	(6,509)	(51,909)	(76,229)	(29,153)
Series B Preferred Stock dividends declared	0	0	0	0
Income (loss) applicable to common shareholders	(6,509)	(51,909)	(76,229)	(29,153)
Changes in comprehensive income (loss)	0	0	0	38
Comprehensive income (loss)	(6,509)	(51,909)	(76,229)	(29,115)
Revenues	144,999	124,497	409,339	381,556
Lucky Friday suspension-related costs		(6,519)	(8,766)	(18,337)
Reportable Legal Entities [Member] | Non-Guarantor Subsidiaries [Member]
Revenues	15,484	14,132	39,118	40,729
Cost of sales	(9,577)	(12,576)	(29,615)	(27,666)
Depreciation, depletion, amortization	(3,326)	(1,795)	(6,934)	(3,586)
General and administrative	(305)	(443)	(1,174)	(1,352)
Exploration and pre-development	(1,371)	(2,378)	(5,424)	(8,525)
Research and development	(90)	(537)	(93)	(1,340)
Gain (loss) on derivative contracts	0	0	0	0
Foreign exchange gain (loss)	(1,155)	777	75	421
Lucky Friday suspension-related costs	0
Acquisition costs	0	(12)	(153)	(161)
Equity in earnings of subsidiaries	0	0	0	0
Other (expense) income	1,606	(262)	2,308	722
Income (loss) before income taxes	1,266	(3,094)	(1,892)	(758)
(Provision) benefit from income taxes	(1,518)	385	558	(1,194)
Net income (loss)	(252)	(2,709)	(1,334)	(1,952)
Series B Preferred Stock dividends declared	0	0	0	0
Income (loss) applicable to common shareholders	(252)	(2,709)	(1,334)	(1,952)
Changes in comprehensive income (loss)	0	0	0	0
Comprehensive income (loss)	(252)	(2,709)	(1,334)	(1,952)
Revenues	15,484	14,132	39,118	40,729
Lucky Friday suspension-related costs		0	0	0
Consolidation, Eliminations [Member]
Revenues	0	0	0	0
Cost of sales	0	0	0	0
Depreciation, depletion, amortization	0	0	0	0
General and administrative	0	0	0	0
Exploration and pre-development	0	0	0	0
Research and development	0	0	0	0
Gain (loss) on derivative contracts	0	0	0	0
Foreign exchange gain (loss)	0	0	0	0
Lucky Friday suspension-related costs	0
Acquisition costs	0	0	0	0
Equity in earnings of subsidiaries	6,761	54,618	77,563	31,105
Other (expense) income	(3,757)	(19,825)	(12,589)	(29,027)
Income (loss) before income taxes	3,004	34,793	64,974	2,078
(Provision) benefit from income taxes	3,757	19,825	12,589	29,027
Net income (loss)	6,761	54,618	77,563	31,105
Series B Preferred Stock dividends declared	0	0	0	0
Income (loss) applicable to common shareholders	6,761	54,618	77,563	31,105
Changes in comprehensive income (loss)	0	0	0	(38)
Comprehensive income (loss)	6,761	54,618	77,563	31,067
Revenues	$ 0	0	0	0
Lucky Friday suspension-related costs		$ 0	$ 0	$ 0

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