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Note 5 - Income Taxes - Components of the Net Deferred Tax Asset (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Accrued reclamation costs | $ 30,188 | $ 26,473 |  |
Deferred exploration | 26,785 | 29,120 |  |
Foreign net operating losses | 1,058 | 21,140 |  |
Domestic net operating losses | 82,359 | 82,116 |  |
AMT credit carryforwards | 20,405 | 11,607 |  |
Pension and benefit obligation | 18,115 | 18,916 |  |
Foreign exchange loss | 34,977 | 38,779 |  |
Foreign tax credit carryforward | 7,283 | 6,692 |  |
Miscellaneous | 30,166 | 27,205 |  |
Total deferred tax assets | 251,336 | 262,048 |  |
Valuation allowance | (99,602) | (115,806) | $ (32,094) | $ (27,155)
Total deferred tax assets | 151,734 | 146,242 |  |
Deferred tax liabilities: |  |  |  |
Miscellaneous | (3,046) | (2,394) |  |
Properties, plants and equipment | (235,700) | (209,577) |  |
Total deferred tax liabilities | (238,746) | (211,971) |  |
Net deferred tax liability | $ (87,012) | $ (65,729) |  |

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