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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2025
Income Tax Disclosure [Abstract]  
Schedule of Income (Loss) Before Income Tax Benefit
The components of Income before income tax benefit and the Income tax benefit for the years ended December 31 are as follows:
 20252024
Income before income tax benefit  
Domestic$13,159 $33,637 
Foreign(15)9 
$13,144 $33,646 
Income tax benefit 
Current income tax provision (benefit): 
Federal$(5,392)$(2,520)
State907 906 
Foreign(3)2 
Total current(4,488)(1,612)
Deferred income tax provision (benefit):
Federal436 1,373 
State(378)144 
Total deferred58 1,517 
 $(4,430)$(95)
Schedule of Cash Flow, Supplemental Disclosures
Cash paid for income taxes (net of refunds) were as follows:
 2025
U.S. Federal
$— 
U.S. State
615 
Total net income tax payments
$615 
Schedule of Effective Income Tax Rate Reconciliation A reconciliation of the federal statutory and effective income tax rate, applying ASU 2023-09 prospectively, for the year ended December 31 is as follows:
 2025
Amount
Percent
Income before income tax benefit
$13,144 
Statutory taxes
$2,760 21.0 %
State and local income taxes, net of federal income tax effect (a)
339 2.6 %
Tax credits:
     Research and development credit(604)(4.6)%
Nondeductible compensation
856 6.5 %
Nondeductible meals
137 1.0 %
Changes in unrecognized tax benefits
(57)(0.4)%
Other reconciling items:
    Percentage depletion
(5,398)(41.1)%
    Deferred tax adjustments
(2,429)(18.5)%
    Other, net
(34)(0.3)%
Income tax benefit at the effective income tax rate
$(4,430)(33.7)%
(a) During the year ended December 31, 2025, state taxes in Louisiana, North Dakota, Mississippi and Pennsylvania made up the majority of the tax effect in this category.

The reconciliation from the statutory federal income tax rate to our effective income tax rate, applying ASC 740 prior to the adoption of ASU 2023-09, is as follows:
 2024
Income before income tax benefit
$33,646 
Statutory taxes at 21.0%
$7,066 
State and local income taxes
556 
Non-deductible expenses927 
Percentage depletion(4,683)
R&D and other federal credits(796)
Settlements and uncertain tax positions(2,273)
Other, net(892)
Income tax benefit
$(95)
Effective income tax rate(0.3)%
Schedule of Deferred Tax Assets and Liabilities
A detailed summary of the total deferred tax assets and liabilities in our Consolidated Balance Sheets resulting from differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes is as follows:
 December 31
 20252024
Deferred tax assets  
Lease liabilities$770 $1,252 
Tax carryforwards22,769 12,371 
Inventories3,278 6,029 
Accrued liabilities8,738 9,430 
Employee benefits3,471 3,630 
Land valuation adjustment6,467 6,489 
Partnership investment - development costs6,497 14,819 
Other8,769 7,866 
Total deferred tax assets60,759 61,886 
Less: Valuation allowance12,289 11,672 
 48,470 50,214 
Deferred tax liabilities 
Lease right-of-use assets719 1,209 
Depreciation and depletion28,217 23,731 
Accrued pension benefits5,533 10,633 
Total deferred tax liabilities34,469 35,573 
Net deferred asset
$14,001 $14,641 
Schedule of Tax Credit Carryforwards
The following table summarizes the tax carryforwards and associated carryforward periods and related valuation allowances where we have determined that realization is uncertain:
 December 31, 2025
 
Net deferred tax asset
Valuation allowance
Carryforwards expire during:
State net operating loss$19,327 $15,168 
2026-2045
Federal net operating loss
7,050 — Indefinite
Research credit
391 — 
2044-2045
Total
$26,768 $15,168 

 December 31, 2024
 
Net deferred tax asset
Valuation allowance
Carryforwards expire during:
State net operating loss$15,584 $14,610 
2025-2044
Schedule of Unrecognized Tax Benefits Roll Forward
The following is a reconciliation of our total gross unrecognized tax benefits, defined as the aggregate tax effect of differences between tax return positions and the benefits recognized in the financial statements for the years ended December 31, 2025 and 2024. Approximately $0.6 million of the gross unrecognized tax benefits as of December 31, 2025 and 2024 relate to permanent items that, if recognized, would impact the effective income tax rate. This amount differs from the gross unrecognized tax benefits presented in the table below due to (1) the deferred tax asset which would be available if the position were not sustained upon audit and (2) the decrease in U.S. federal income taxes which would occur upon the recognition of the state tax benefits included herein.
 20252024
Balance at January 1$752 $6,148 
Decreases based on lapse of applicable statute of limitations(61)(5,396)
Balance at December 31$691 $752