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Note 3 - Income and Mining Taxes (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | $ (3,400) |  | $ (8,600) |
Income Tax Expense (Benefit), Total | (4,842) | $ 626 | $ (208) | $ (436)
Recognition of Previously Omitted Deferred Income Taxes on Certain State Mining Income Taxes [Member] |  |  |  |
Income Tax Expense (Benefit), Total | $ 3,500 | $ 6,500 |  |

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