Note 6 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	2018			2017			2016
				Revised			Revised
Current:
Domestic	$	(454	)	$	22,171		$	(10,702	)
Foreign		(4,382	)		(22,526	)		(13,713	)
Total current income tax benefit (provision)		(4,836	)		(355	)		(24,415	)
Deferred:
Domestic		7,147			(30,766	)		7,480
Foreign		4,390			10,158			(11,155	)
Total deferred income tax benefit (provision)		11,537			(20,608	)		(3,675	)
Total income tax benefit (provision)	$	6,701		$	(20,963	)	$	(28,090	)

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	2018			2017			2016
				Revised			Revised
Domestic	$	(44,513	)	$	(7,920	)	$	41,014
Foreign		11,249			363			48,645
Total	$	(33,264	)	$	(7,557	)	$	89,659

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2018					2017					2016
						Revised					Revised
Computed “statutory” benefit (provision)	$	6,986		(21	)%	$	2,645		35	%	$	(31,381	)	35	%
Percentage depletion		3,158		(10	)		5,174		68			8,114		(9	)
Change in valuation allowance		(2,304	)	7			24,464		324			11,336		(13	)
Federal rate change		—		—			(37,546	)	(497	)		—		—
State taxes, net of federal taxes		(849	)	3			1,112		15			(565	)	—
Foreign currency remeasurement of monetary assets and liabilities		6,747		(20	)		(12,812	)	(169	)		(7,820	)	9
Rate differential on foreign earnings		(3,970	)	12			(1,438	)	(19	)		(6,853	)	8
Compensation		(970	)	3			(661	)	(9	)		(1,517	)	2
Foreign withholding taxes		278		(1	)		(278	)	(4	)		—		—
Expiration of U.S. foreign tax credits		—		—			(2,300	)	(30	)		—		—
Other		(2,375	)	7			677		9			596		(1	)
Total benefit (provision)	$	6,701		(20	)%	$	(20,963	)	(277	)%	$	(28,090	)	31	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2018			2017
				Revised
Deferred tax assets:
Accrued reclamation costs	$	29,064		$	21,812
Deferred exploration		16,500			17,426
Foreign net operating losses		13,231			1,003
Domestic net operating losses		152,320			130,186
AMT credit carryforwards		—			584
Pension and benefit obligation		12,345			12,584
Foreign exchange loss		24,849			18,112
Foreign tax credit carryforward		4,149			4,983
Miscellaneous		26,290			25,411
Total deferred tax assets		278,748			232,101
Valuation allowance		(94,981	)		(78,684	)
Total deferred tax assets		183,767			153,417
Deferred tax liabilities:
Miscellaneous		(5,234	)		(4,978	)
Properties, plants and equipment		(350,083	)		(271,282	)
Total deferred tax liabilities		(355,317	)		(276,260	)
Net deferred tax liability	$	(171,550	)	$	(122,843	)

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

	2018			2017			2016
Balance at beginning of year	$	(78,684	)	$	(99,602	)	$	(115,806	)
Valuation allowance on deferred tax assets acquired with the Klondex acquisition		(11,470	)		—			—
Increase related to non-utilization of net operating loss carryforwards and non-recognition of deferred tax assets due to uncertainty of recovery		(5,700	)		(14,964	)		(2,868	)
Decrease related to utilization and expiration of deferred tax assets, other		873			35,882			19,072
Balance at end of year	$	(94,981	)	$	(78,684	)	$	(99,602	)