v3.26.3
Note 5 - Segment Information - Information By Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Revenues $ 48,941 $ 51,415 $ 149,093 $ 153,942  
Equity in loss of Sisecam Wyoming (4,126) (2,390) (16,859) 4,746  
Gain on asset sales and disposals 5 906 49 1,882  
Total revenues and other income 44,820 49,931 132,283 160,570  
Compensation (salaries, benefits and bonus) 3,776 3,618 11,433 11,195  
Property taxes 1,650 2,035 5,405 5,594  
Depreciation, depletion and amortization 6,526 3,868 25,271 11,611  
Other items (1) [1] 6,326 9,505 18,837 26,781  
Net income (loss) 26,542 30,905 71,337 105,369  
Total assets 763,943 748,365 763,943 748,365 $ 748,365
Asset impairments 0 0 0 20  
Mineral Rights Segment [Member]          
Depreciation, depletion and amortization 5,800 3,800 21,300 11,000  
Operating Segments [Member]          
Revenues 48,941 51,415 149,093 153,942  
Equity in loss of Sisecam Wyoming (4,126) (2,390) (16,859) 4,746  
Gain on asset sales and disposals 5 906 49 1,882  
Total revenues and other income 44,820 49,931 132,283 160,570  
Compensation (salaries, benefits and bonus) 1,781 1,692 5,386 5,313  
Property taxes 1,650 2,035 5,405 5,594  
Depreciation, depletion and amortization 6,521 3,864 25,257 11,597  
Other items (1) [1] 2,109 3,927 6,593 7,682  
Net income (loss) 32,759 38,413 89,642 130,364  
Total assets 759,865 742,916 759,865 742,916  
Asset impairments       20  
Operating Segments [Member] | Mineral Rights Segment [Member]          
Revenues 48,941 51,415 149,093 153,942  
Equity in loss of Sisecam Wyoming 0 0 0 0  
Gain on asset sales and disposals 5 906 49 1,882  
Total revenues and other income 48,946 52,321 149,142 155,824  
Compensation (salaries, benefits and bonus) 1,781 1,692 5,386 5,313  
Property taxes 1,650 2,035 5,405 5,594  
Depreciation, depletion and amortization 6,521 3,864 25,257 11,597  
Other items (1) [1] 2,057 3,871 6,390 7,542  
Net income (loss) 36,937 40,859 106,704 125,758  
Total assets 485,668 492,672 485,668 492,672  
Asset impairments       20  
Operating Segments [Member] | Soda Ash Segment [Member]          
Revenues 0 0 0 0  
Equity in loss of Sisecam Wyoming (4,126) (2,390) (16,859) 4,746  
Gain on asset sales and disposals 0 0 0 0  
Total revenues and other income (4,126) (2,390) (16,859) 4,746  
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] 52 56 203 140  
Net income (loss) (4,178) (2,446) (17,062) 4,606  
Total assets 274,197 250,244 274,197 250,244  
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) 1,995 1,926 6,047 5,882  
Property taxes 0 0 0 0  
Depreciation, depletion and amortization 5 4 14 14  
Other items (1) [1] 4,217 5,578 12,244 19,099  
Net income (loss) (6,217) (7,508) (18,305) (24,995)  
Total assets $ 4,078 $ 5,449 $ 4,078 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.