CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues
Revenues	$ 50,909	$ 41,674
Cost of revenues
Labor and other operating expenses	31,259	24,593
Depreciation, depletion and amortization	5,183	5,276
Total cost of revenues	36,442	29,869
Gross profit	14,467	11,805
Selling, general and administrative expenses	3,635	3,067
Operating profit	10,832	8,738
Other expense (income)
Interest expense	63	62
Interest and other income, net	(60)	(34)
Total other expense (income)	3	28
Income before income tax expense	10,829	8,710
Income tax expense	2,161	1,679
Net income	$ 8,668	$ 7,031
Net income per share of common stock
Basic (in dollars per share)	$ 1.53	$ 1.24
Diluted (in dollars per share)	$ 1.53	$ 1.24