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Note 6 - Income Taxes - Components of the Net Deferred Tax Asset (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accrued reclamation costs | $ 32,938 | $ 30,038 |  |
Deferred exploration | 11,623 | 13,762 |  |
Foreign net operating losses | 13,303 | 12,013 |  |
Domestic net operating losses | 198,438 | 175,024 |  |
Pension and benefit obligation | 12,341 | 13,866 |  |
Foreign exchange loss | 19,808 | 21,719 |  |
Foreign tax credit carryforward | 3,358 | 4,149 |  |
Miscellaneous | 18,385 | 30,871 |  |
Total deferred tax assets | 310,194 | 301,442 |  |
Valuation allowance | (77,210) | (86,634) | $ (94,981) | $ (78,684)
Total deferred tax assets | 232,984 | 214,808 |  |
Miscellaneous | (2,551) | (904) |  |
Properties, plants and equipment | (359,996) | (348,649) |  |
Total deferred tax liabilities | (362,547) | (349,553) |  |
Net deferred tax liability | $ (129,563) | $ (134,745) |  |

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