Note 7 - Income and Mining Taxes - Schedule of Effective Income Tax Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
		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		$ (100,628)	$ (13,905)	$ 17,429
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]	$ (18,182)	$ (6,058)	$ (3,135)
State taxes, net of federal tax benefit, Percentage	[1]	4.00%	9.00%	(4.00%)
US Mining and other taxes, Amount	[2]	$ (16,884)	$ (6,611)	$ (3,867)
US Mining and other taxes, Percentage	[2]	4.00%	10.00%	(5.00%)
Percentage depletion, Amount		$ 23,571	$ 9,896	$ 4,205
Percentage depletion, Percentage		(5.00%)	(15.00%)	5.00%
Transfer Pricing Allocation, Amount		$ (1,795)	$ (755)	$ 0
Transfer Pricing Allocation, Percentage		0.00%	1.00%	0.00%
Global intangible low-taxed income, Amount		$ (12,202)	$ 0	$ 0
Global intangible low-taxed income, Percentage		3.00%	0.00%	0.00%
Subpart F, Amount		$ (6,368)	$ 0	$ 0
Subpart F, Percentage		1.00%	0.00%	0.00%
Change in valuation allowance, Amount		$ (3,875)	$ (3,387)	$ (5,712)
Change in valuation allowance, Percentage		1.00%	5.00%	(7.00%)
Compensation, Amount		$ (838)	$ (2,588)	$ (1,536)
Compensation, Percentage		0.00%	4.00%	(2.00%)
Other, Amount		$ (2,331)	$ (2,224)	$ (1,673)
Other, Percentage		1.00%	3.00%	(2.00%)
Total income and mining tax (provision) benefit		$ (157,467)	$ (30,414)	$ (1,222)
Total (provision) benefit, Percentage		33.00%	46.00%	(1.00%)
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%)	11.00%	(8.00%)
Provincial - Change in valuation allowance, Amount		$ 3,495	$ (5,598)	$ (4,764)
Provincial - Change in valuation allowance, Percentage		(1.00%)	8.00%	(6.00%)
Provincial - Currency remeasurement, Amount		$ (319)	$ 1,856	$ (1,888)
Provincial - Currency remeasurement, Percentage		0.00%	(3.00%)	(2.00%)
Rate differential on foreign earnings, Amount		$ 8,480	$ (3,154)	$ (7,887)
Rate differential on foreign earnings, Percentage		(2.00%)	5.00%	(9.00%)
Currency remeasurement, Amount		$ (1,178)	$ 1,623	$ (2,471)
Currency remeasurement, Percentage		0.00%	(2.00%)	(3.00%)
Mining taxes, Amount		$ (24,927)	$ (757)	$ 3,736
Mining taxes, Percentage		5.00%	1.00%	5.00%
Provincial taxes, Amount		$ (12,480)	$ 6,965	$ 13,144
Provincial taxes, Percentage		3.00%	(11.00%)	16.00%
Other, Amount		$ 5,013	$ 1,806	$ 790
Other, Percentage		(1.00%)	(3.00%)	1.00%
Mexico
Effective Income Tax Rate Reconciliation [Line Items]
Change in valuation allowance, Amount		$ (2,179)	$ 1,617	$ (3,098)
Change in valuation allowance, Percentage		1.00%	(2.00%)	(4.00%)
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%	0.00%
Other, Amount		$ (15)	$ (67)	$ 1,584
Other, Percentage		0.00%	0.00%	2.00%

[1] State taxes in Alaska made up the majority (greater than 50 percent) of the tax effect in this category.

[2] Mining taxes for Alaska Mine License Tax made up the majority (greater than 50 percent) of the tax effect in this category.