Note 15 - Segment Reporting - Reconciliation of operating profit and capital expenditure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEGMENT REPORTING
Cash Cost of Sales	$ 420,768	$ 380,227	$ 263,384
Transportation costs	106,241	105,739	58,113
Alternative Mineral Development Costs	4,755	3,849	1,989
Other Cost of Sales	1,529	3,978	9,474
Cost of Sales	533,293	493,793	332,960
Total capital expenditures (including accrued capital expenditures)	$ 71,656	$ 75,825	$ 136,541