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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenues:        
Revenues $ 25,819 $ 17,779 $ 69,236 $ 48,291
Operating expenses:        
Cost of revenues 19,904 14,369 54,945 37,301
Change in unrealized gain on natural gas derivatives (926) 0 (27) 0
Selling, general and administrative expenses 3,658 5,286 9,643 10,558
Loss (gain) from disposal of fixed assets 46 0 (34) (24)
Depreciation expense 2,115 2,284 6,589 6,653
Impairment of right-of-use lease asset 0 376 0 376
Total operating expenses 24,797 22,315 71,116 54,864
Income (loss) from operations before equity income 1,022 (4,536) (1,880) (6,573)
Net equity income from foreign joint venture operations:        
Income from equity investment in foreign joint venture 205 308 1,126 1,267
Foreign joint venture operating related expenses (91) (62) (239) (192)
Net equity income from foreign joint venture operations 114 246 887 1,075
Income (loss) from operations 1,136 (4,290) (993) (5,498)
Other income (expense):        
Interest expense, net (150) (119) (437) (189)
Interest expense, net - related parties (49) (120) (129) (441)
Other income (expense) (28) 37 (99) 1,031
Total other income (expense) (227) (202) (665) 401
Net income (loss) from continuing operations before income tax expense 909 (4,492) (1,658) (5,097)
Income tax (benefit) expense (115) 89 (248) 229
Net income (loss) from continuing operations 1,024 (4,581) (1,410) (5,326)
Loss from discontinued operations, net of tax (1,301) (44) (1,441) (128)
Net loss $ (277) $ (4,625) $ (2,851) $ (5,454)
Net income (loss) per common share (Note 13):        
Basic income (loss) per common share from continuing operations (in usd per share) $ 0.06 $ (0.26) $ (0.08) $ (0.31)
Basic loss per common share from discontinued operations (in usd per share) (0.07) 0 (0.08) (0.01)
Basic net loss per common share (in usd per share) (0.02) (0.26) (0.16) (0.32)
Diluted income (loss) per common share from continuing operations (in usd per share) 0.06 (0.26) (0.08) (0.31)
Diluted loss per common share from discontinued operations (in usd per share) (0.07) 0 (0.08) (0.01)
Diluted net loss per common share (in usd per share) $ (0.01) $ (0.26) $ (0.16) $ (0.32)