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Note 6 - Segment Information - Information By Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Revenues $ 85,513 $ 101,904 $ 275,891 $ 291,208
Gain on asset sales and disposals 854 354 955 699
Operating and maintenance expenses 8,358 7,898 23,451 25,989
Depreciation, depletion and amortization 4,594 6,850 12,469 16,565
General and administrative expenses 5,669 4,518 17,157 14,037
Asset impairments 63 812 132 874
Other expenses, net 3,837 7,625 10,182 29,168
Net income (loss) 63,846 74,555 213,455 205,274
Corporate, Non-Segment [Member]        
Revenues 0 0 0 0
Gain on asset sales and disposals 0 0 0 0
Operating and maintenance expenses 0 0 0 0
Depreciation, depletion and amortization 5 0 14 0
General and administrative expenses 5,669 4,518 17,157 14,037
Asset impairments 0 0 0 0
Other expenses, net 3,837 7,625 10,182 29,168
Net income (loss) (9,511) (12,143) (27,353) (43,205)
Mineral Rights Segment [Member]        
Depreciation, depletion and amortization 4,100 6,400 11,600 15,500
Mineral Rights Segment [Member] | Operating Segments [Member]        
Revenues 73,112 87,348 217,258 247,172
Gain on asset sales and disposals 854 354 955 699
Operating and maintenance expenses 8,305 7,867 23,226 25,884
Depreciation, depletion and amortization 4,589 6,850 12,455 16,565
General and administrative expenses 0 0 0 0
Asset impairments 63 812 132 874
Other expenses, net 0 0 0 0
Net income (loss) 61,009 72,173 182,400 204,548
Soda Ash Segment [Member] | Operating Segments [Member]        
Revenues 12,401 14,556 58,633 44,036
Gain on asset sales and disposals 0 0 0 0
Operating and maintenance expenses 53 31 225 105
Depreciation, depletion and amortization 0 0 0 0
General and administrative expenses 0 0 0 0
Asset impairments 0 0 0 0
Other expenses, net 0 0 0 0
Net income (loss) $ 12,348 $ 14,525 $ 58,408 $ 43,931