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Note 6 - Income Taxes (Tables) | 12 Months Ended
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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 | )

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of unrecognized tax benefits for which a material change is reasonably possible in the next twelve months, typically including the nature of the uncertainty, the event(s) that could cause a material change, and an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made. An unrecognized tax benefit is the difference between a tax position taken in a tax return and the amounts recognized in the financial statements for which it is more likely than not, based on the technical merits of the position, that the tax position will not be sustained upon examination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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