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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Revenues:        
Revenue $ 34,774 $ 29,829 $ 81,919 $ 71,079
Cost of revenue, exclusive of depreciation and amortization 21,339 20,707 52,279 53,218
Operating expenses:        
Selling, general and administrative 8,058 8,297 22,735 27,574
Research and development 787 639 3,341 2,145
Depreciation, amortization, depletion and accretion 2,716 2,711 6,090 7,276
Gain on sale of assets (154) 0 (154) (2,695)
Total operating expenses 11,407 11,647 32,012 34,300
Operating income (loss) 2,028 (2,525) (2,372) (16,439)
Other (expense) income:        
Earnings from equity method investments 127 412 127 1,512
Interest expense (806) (787) (2,426) (2,155)
Other 268 725 931 1,510
Total other (expense) income (411) 350 (1,368) 867
Income (loss) before income taxes 1,617 (2,175) (3,740) (15,572)
Income tax (expense) benefit 0 0 (30) 33
Net income (loss) $ 1,617 $ (2,175) $ (3,770) $ (15,539)
Income (loss) per common share (Note 1):        
Basic (in dollars per share) $ 0.04 $ (0.07) $ (0.11) $ (0.56)
Diluted (in dollars per share) $ 0.04 $ (0.07) $ (0.11) $ (0.56)
Weighted-average number of common shares outstanding:        
Basic (in shares) 36,124 31,807 34,085 27,894
Diluted (in shares) 37,442 31,807 34,085 27,894