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Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenues:        
Revenue from Contract with Customer, Product and Service [Extensible Enumeration] Product [Member] Product [Member] Product [Member] Product [Member]
Total revenues $ 20,445 $ 24,739 $ 41,250 $ 51,141
Operating expenses:        
Consumables cost of revenue, exclusive of depreciation and amortization 15,336 19,910 32,511 41,417
Payroll and benefits 3,555 2,519 8,254 5,145
Legal and professional fees 1,868 1,555 6,406 3,727
General and administrative 3,345 1,869 6,123 3,795
Depreciation, amortization, depletion and accretion 2,428 1,588 4,565 3,094
Gain on sale of Marshall Mine, LLC 0 0 (2,695) 0
Other 0 34 0 34
Total operating expenses 26,532 27,475 55,164 57,212
Operating loss (6,087) (2,736) (13,914) (6,071)
Other income (expense):        
Earnings from equity method investments 462 2,389 1,100 3,222
Interest expense (834) (90) (1,368) (176)
Other 603 111 785 (334)
Total other income 231 2,410 517 2,712
Loss before income taxes (5,856) (326) (13,397) (3,359)
Income tax benefit 0 0 33 0
Net loss $ (5,856) $ (326) $ (13,364) $ (3,359)
Loss per common share (Note 1):        
Basic (in dollars per share) $ (0.21) $ (0.02) $ (0.53) $ (0.18)
Diluted (in dollars per share) $ (0.21) $ (0.02) $ (0.53) $ (0.18)
Weighted-average number of common shares outstanding:        
Basic (in shares) 27,360 18,473 25,739 18,409
Diluted (in shares) 27,360 18,473 25,739 18,409