CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues
Revenues	$ 41,674	$ 38,440
Cost of revenues
Labor and other operating expenses	24,593	23,962
Depreciation, depletion and amortization	5,276	4,601
Total cost of revenues	29,869	28,563
Gross profit	11,805	9,877
Selling, general and administrative expenses	3,067	3,219
Operating profit	8,738	6,658
Other expense (income)
Interest expense	62	62
Interest and other income, net	(34)	(247)
Total other expense (income)	28	(185)
Income before income tax expense	8,710	6,843
Income tax expense	1,679	1,299
Net income	$ 7,031	$ 5,544
Net income per share of common stock
Basic (in dollars per share)	$ 1.24	$ 0.99
Diluted (in dollars per share)	$ 1.24	$ 0.98