Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amount
Income taxes computed at the federal statutory rate	$ 28,640	$ 19,606	$ 11,878
(Reduction) increase in taxes resulting from:
Statutory depletion in excess of basis	(2,701)	(2,172)	(1,869)
State income taxes, net of federal income tax benefit	682	1,144	557
Disallowed executive compensation	2,040	818	493
Stock-based compensation	(1,105)	(218)	33
Other	(12)	(365)	41
Income tax expense	$ 27,544	$ 18,813	$ 11,133
Percent of Pretax Income
Income taxes computed at the federal statutory rate (as a percent)	21.00%	21.00%	21.00%
(Reduction) increase in taxes resulting from (as a percent):
Statutory depletion in excess of basis (as a percent)	(2.00%)	(2.30%)	(3.30%)
State income taxes, net of federal income tax benefit (as a percent)	0.50%	1.20%	1.00%
Disallowed executive compensation (as a percent)	1.50%	0.90%	0.90%
Stock-based compensation (as a percent)	(0.80%)	(0.20%)
Other (as a percent)	0.00%	(0.40%)	0.10%
Income tax expense (as a percent)	20.20%	20.20%	19.70%
Deferred tax liabilities
Property, plant and equipment	$ 24,187	$ 25,207
Operating lease right-of-use assets	1,095	1,195
Total	25,282	26,402
Deferred tax assets
Operating lease liabilities	1,136	1,247
Other	487	496
Total	1,623	1,743
Deferred tax liabilities, net, Total	23,659	24,659
Current income taxes:
Accrued expenses	466	2,010
Current income tax expense	28,544	19,736	$ 8,606
Deferred income tax (benefit) expense	(1,000)	(923)	2,527
Income tax expense	27,544	$ 18,813	$ 11,133
Federal
Operating loss carry forwards
Net operating loss carryforwards	$ 0