v3.26.1
Note 7 - Income and Mining Taxes - Schedule of Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items]          
Income and mining tax (provision) / benefit at statutory rate, Amount     $ (74,927) $ (18,943) $ 5,880
Income and mining tax (provision) / benefit at statutory rate, Percentage     21.00% 21.00% 21.00%
State taxes, net of federal tax benefit, Amount [1]     $ (16,080) $ (7,102) $ (1,623)
State taxes, net of federal tax benefit, Percentage [1]     4.00% 8.00% (6.00%)
US Mining and other taxes, Amount [2]     $ (16,884) $ (6,611) $ (3,867)
US Mining and other taxes, Percentage [2]     5.00% 7.00% (14.00%)
Percentage depletion, Amount     $ 23,571 $ 9,896 $ 4,205
Percentage depletion, Percentage     (7.00%) (11.00%) 15.00%
Transfer Pricing Allocation, Amount     $ (1,795) $ (755) $ 0
Transfer Pricing Allocation, Percentage     1.00% 1.00% 0.00%
Global intangible low-taxed income, Amount     $ (5,634) $ 0 $ 0
Global intangible low-taxed income, Percentage     2.00% 0.00% 0.00%
Subpart F, Amount     $ (6,368) $ 0 $ 0
Subpart F, Percentage     2.00% 0.00% 0.00%
Change in valuation allowance, Amount     $ (3,875) $ (3,387) $ (5,712)
Change in valuation allowance, Percentage     1.00% 4.00% (20.00%)
Compensation, Amount     $ (838) $ (2,588) $ (1,536)
Compensation, Percentage     0.00% 3.00% (6.00%)
Other, Amount     $ (2,332) $ (2,224) $ (1,673)
Other, Percentage     1.00% 2.00% (6.00%)
Total income and mining tax provision $ (50,900) $ (14,304) $ (98,742) $ (39,969) $ (12,246)
Total (provision) benefit, Percentage     28.00% 44.00% (44.00%)
Canada          
Effective Income Tax Rate Reconciliation [Line Items]          
Change in valuation allowance, Amount     $ 4,437 $ (7,000) $ (6,731)
Change in valuation allowance, Percentage     (1.00%) 8.00% (24.00%)
Provincial - Change in valuation allowance, Amount     $ 3,495 $ (5,598) $ (4,764)
Provincial - Change in valuation allowance, Percentage     (1.00%) 6.00% (17.00%)
Provincial - Currency remeasurement, Amount     $ 1,580 $ 1,856 $ (1,888)
Provincial - Currency remeasurement, Percentage     (1.00%) (2.00%) (7.00%)
Rate differential on foreign earnings, Amount     $ 2,808 $ (3,445) $ (12,175)
Rate differential on foreign earnings, Percentage     (1.00%) 4.00% (43.00%)
Currency remeasurement, Amount     $ 1,872 $ (3,065) $ 2,240
Currency remeasurement, Percentage     (1.00%) 3.00% 8.00%
Mining taxes, Amount     $ (3,563) $ 0 $ 0
Mining taxes, Percentage     1.00% 0.00% 0.00%
Provincial taxes, Amount     $ (4,834) $ 7,837 $ 15,516
Provincial taxes, Percentage     1.00% (9.00%) 55.00%
Other, Amount     $ 1,080 $ 1,683 $ 744
Other, Percentage     0.00% (2.00%) 3.00%
Mexico          
Effective Income Tax Rate Reconciliation [Line Items]          
Change in valuation allowance, Amount     $ (2,178) $ 1,617 $ (3,098)
Change in valuation allowance, Percentage     1.00% (2.00%) (11.00%)
Rate differential on foreign earnings, Amount     $ 195 $ 224 $ 369
Rate differential on foreign earnings, Percentage     0.00% 0.00% 1.00%
Currency remeasurement, Amount     $ 1,543 $ (2,297) $ 283
Currency remeasurement, Percentage     0.00% 3.00% 1.00%
Other, Amount     $ (15) $ (67) $ 1,584
Other, Percentage     0.00% 0.00% 6.00%
[1] (a) State taxes in Alaska made up the majority (greater than 50 percent) of the tax effect in this category.
[2] (b) Mining taxes for Alaska Mine License Tax made up the majority (greater than 50 percent) of the tax effect in this category.