v3.26.1
Note 5 - Segment Information - Information By Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Revenues $ 52,970 $ 46,846 $ 100,152 $ 102,527  
Equity in loss of Sisecam Wyoming (4,905) 2,526 (12,733) 7,136  
Gain on asset sales and disposals 45 729 44 976  
Total revenues and other income 48,110 50,101 87,463 110,639  
Compensation (salaries, benefits and bonus) 3,796 3,530 7,657 7,577  
Property taxes 1,876 1,767 3,755 3,559  
Depreciation, depletion and amortization 11,131 3,754 18,745 7,743  
Other items (1) [1] 6,131 6,839 12,511 17,276  
Net income (loss) 25,176 34,211 44,795 74,464  
Total assets 757,535 748,365 757,535 748,365 $ 748,365
Asset impairments 0 0 0 20  
Mineral Rights Segment [Member]          
Depreciation, depletion and amortization 9,400 3,500 15,500 7,200  
Operating Segments [Member]          
Revenues 52,970 46,846 100,152 102,527  
Equity in loss of Sisecam Wyoming (4,905) 2,526 (12,733) 7,136  
Gain on asset sales and disposals 45 729 44 976  
Total revenues and other income 48,110 50,101 87,463 110,639  
Compensation (salaries, benefits and bonus) 1,808 1,683 3,605 3,621  
Property taxes 1,876 1,767 3,755 3,559  
Depreciation, depletion and amortization 11,126 3,748 18,736 7,733  
Other items (1) [1] 2,047 710 4,484 3,755  
Net income (loss) 31,253 42,193 56,883 91,951  
Total assets 752,787 742,916 752,787 742,916  
Asset impairments       20  
Operating Segments [Member] | Mineral Rights Segment [Member]          
Revenues 52,970 46,846 100,152 102,527  
Equity in loss of Sisecam Wyoming 0 0 0 0  
Gain on asset sales and disposals 45 729 44 976  
Total revenues and other income 53,015 47,575 100,196 103,503  
Compensation (salaries, benefits and bonus) 1,808 1,683 3,605 3,621  
Property taxes 1,876 1,767 3,755 3,559  
Depreciation, depletion and amortization 11,126 3,748 18,736 7,733  
Other items (1) [1] 1,968 686 4,333 3,671  
Net income (loss) 36,237 39,691 69,767 84,899  
Total assets 475,312 492,672 475,312 492,672  
Asset impairments       20  
Operating Segments [Member] | Soda Ash Segment [Member]          
Revenues 0 0 0 0  
Equity in loss of Sisecam Wyoming (4,905) 2,526 (12,733) 7,136  
Gain on asset sales and disposals 0 0 0 0  
Total revenues and other income (4,905) 2,526 (12,733) 7,136  
Compensation (salaries, benefits and bonus) 0 0 0 0  
Property taxes 0 0 0 0  
Depreciation, depletion and amortization 0 0 0 0  
Other items (1) [1] 79 24 151 84  
Net income (loss) (4,984) 2,502 (12,884) 7,052  
Total assets 277,475 250,244 277,475 250,244  
Asset impairments       0  
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]          
Revenues 0 0 0 0  
Equity in loss of Sisecam Wyoming 0 0 0 0  
Gain on asset sales and disposals 0 0 0 0  
Total revenues and other income 0 0 0 0  
Compensation (salaries, benefits and bonus) 1,988 1,847 4,052 3,956  
Property taxes 0 0 0 0  
Depreciation, depletion and amortization 5 6 9 10  
Other items (1) [1] 4,084 6,129 8,027 13,521  
Net income (loss) (6,077) (7,982) (12,088) (17,487)  
Total assets $ 4,748 $ 5,449 $ 4,748 5,449  
Asset impairments       $ 0  
[1] Other items in the Mineral Rights reportable segment primarily include: insurance, legal, overriding royalty expense, processing and transportation expense, information technology, shared facility services, rent, professional fees, long-term incentive compensation expense and bad debt expense. Other items in the Soda Ash reportable segment primarily include professional fees. Other items in Corporate and Financing primarily include: interest expense, net, long-term incentive compensation expense, insurance, legal, information technology, shared facility services, rent and professional fees.