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Note 7 - Income and Mining Taxes - Reconciliation of Statutory Federal Income Tax Rate to Annual Tax Provision (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Computed “statutory” benefit (provision), Amount | $ (1,161) | $ 264 | $ 23,778
Computed “statutory” benefit (provision), Percentage | 21.00% | 21.00% | 21.00%
Percentage depletion, Amount | $ 8,076 | $ 5,327 | $ 3,030
Percentage depletion, Percentage | (146.00%) | 423.00% | 3.00%
Change in valuation allowance, Amount | $ 38,058 | $ 786 | $ 686
Change in valuation allowance, Percentage | (689.00%) | 62.00% | 0.00%
State taxes, net of federal tax benefit, Amount | $ (5,844) | $ (1,164) | $ 2,648
State taxes, net of federal tax benefit, Percentage | 106.00% | (93.00%) | 2.00%
Foreign currency remeasurement of monetary assets and liabilities, Amount | $ (3,625) | $ (4,824) | $ (8,629)
Foreign currency remeasurement of monetary assets and liabilities, Percentage | 66.00% | (383.00%) | (8.00%)
Rate differential on foreign earnings, Amount | $ 2,445 | $ 2,362 | $ 3,999
Rate differential on foreign earnings, Percentage | (44.00%) | 188.00% | 4.00%
Compensation, Amount | $ 1,094 | $ (458) | $ (1,056)
Compensation, Percentage | (20.00%) | (36.00%) | (1.00%)
Mining and other taxes, Amount | $ (6,990) | $ (9,245) | $ (4,887)
Mining and other taxes, percentage | 126.00% | (735.00%) | (4.00%)
Other, Amount | $ (2,484) | $ (1,247) | $ (1,251)
Other, Percentage | 45.00% | (99.00%) | (1.00%)
Total benefit (provision) | $ 29,569 | $ (8,199) | $ 18,318
Total benefit (provision) | (535.00%) | (652.00%) | 16.00%

X
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to mining and other taxes. + References No definition available. + Details
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- Definition The remeasurement of cash balances of assets and liabilities from foreign currencies to USD. + References No definition available. + Details
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