Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues
Revenues	$ 281,330	$ 236,150	$ 189,255
Cost of revenues
Labor and other operating expenses	154,930	143,887	109,365
Depreciation, depletion and amortization	23,533	21,921	20,630
Total cost of revenues	178,463	165,808	129,995
Gross profit	102,867	70,342	59,260
Selling, general and administrative expenses	17,445	15,559	12,843
Operating profit	85,422	54,783	46,417
Other expense (income)
Other (income) expense, net	(7,940)	(1,779)	(101)
Income before income tax expense	93,362	56,562	46,518
Income tax expense	18,813	11,133	9,473
Net income	$ 74,549	$ 45,429	$ 37,045
Net income per share of common stock
Basic (in dollars per share)	$ 13.10	$ 8.01	$ 6.55
Diluted (in dollars per share)	$ 13.06	$ 8.00	$ 6.54