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CONDENSED CONSOLIDATED INCOME STATEMENTS (UNAUDITED) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Revenues: $ 41,605 $ 27,450
Cost of goods sold 43,586 32,427
Gross profit (1,981) (4,977)
Operating expenses:    
Salaries, benefits and payroll taxes 3,392 2,375
Depreciation and amortization 527 561
Selling, general and administrative 4,048 3,154
Total operating expenses 7,967 6,090
Operating loss (9,948) (11,067)
Interest expense, net (427) (547)
Other income 212 198
Total other expenses, net (215) (349)
Loss before income tax benefit (10,163) (11,416)
Income tax benefit (4,240) (7,504)
Net loss $ (5,923) $ (3,912)
Net loss per common share:    
Basic (in dollars per share) $ (0.14) $ (0.09)
Diluted (in dollars per share) $ (0.14) $ (0.09)
Weighted-average number of common shares:    
Basic (in shares) 42,087 41,629
Diluted (in shares) 42,087 41,629
Shortfall Revenues [Member]    
Revenues: $ 1,915 $ 1,741
Logistics [Member]    
Revenues: 1,401 2,562
Sand    
Revenues: $ 38,289 $ 23,147