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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues:        
Total revenues $ 28,854 $ 19,471 $ 69,584 $ 43,217
Operating expenses:        
Payroll and benefits 2,637 2,285 8,014 8,839
Legal and professional fees 1,106 1,321 4,340 4,386
General and administrative 1,715 1,900 5,223 6,693
Depreciation, amortization, depletion and accretion 2,145 1,777 6,155 5,807
Impairment of long-lived assets 0 0 0 26,103
Gain on change in estimate, asset retirement obligation 0 0 (1,942) 0
Total operating expenses 25,555 22,296 65,516 85,748
Operating income (loss) 3,299 (2,825) 4,068 (42,531)
Other income (expense):        
Earnings from equity method investments 22,195 9,518 61,944 25,959
Gain on extinguishment of debt 3,345 0 3,345 0
Interest expense (86) (881) (1,416) (3,053)
Other 81 17 652 208
Total other income 25,535 8,654 64,525 23,114
Income (loss) before income tax expense 28,834 5,829 68,593 (19,417)
Income tax expense 4,581 854 14,013 1,315
Net income (loss) $ 24,253 $ 4,975 $ 54,580 $ (20,732)
Earnings (loss) per common share (Note 1):        
Basic (in dollars per share) $ 1.33 $ 0.27 $ 2.99 $ (1.15)
Diluted (in dollars per share) $ 1.31 $ 0.27 $ 2.96 $ (1.15)
Weighted-average number of common shares outstanding:        
Basic (in shares) 18,292 18,093 18,243 18,014
Diluted (in shares) 18,489 18,103 18,416 18,014
Consumables        
Revenues:        
Total revenues $ 24,689 $ 15,844 $ 57,696 $ 33,231
Operating expenses:        
Consumables cost of revenue, exclusive of depreciation and amortization 17,952 15,013 43,726 33,920
License royalties, related party        
Revenues:        
Total revenues $ 4,165 $ 3,627 $ 11,888 $ 9,986