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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Revenues:    
Revenues $ 98,823 $ 69,171
Operating expenses:    
Cost of revenue 77,694 55,216
Change in unrealized loss on natural gas derivatives 878 0
Selling, general and administrative expenses 13,191 13,792
Gain from disposal of fixed assets (34) (24)
Depreciation expense 8,664 8,894
Impairment of right-of-use lease asset 0 376
Total operating expenses 100,393 78,254
Loss from operations before equity income (1,570) (9,083)
Net equity income from foreign joint venture operations:    
Income from equity investment in foreign joint venture 1,881 2,146
Foreign joint venture operating related expenses (283) (363)
Net equity income from foreign joint venture operations 1,598 1,783
Income (loss) from operations 28 (7,300)
Other income (expense):    
Interest expense, net (591) (324)
Interest expense, net - related parties (179) (577)
Other income (expense) (185) 1,058
Total other income (expense) (955) 157
Loss from continuing operations before income tax expense (927) (7,143)
Income tax expense 265 487
Net loss from continuing operations (1,192) (7,630)
Loss from discontinued operations, net of income taxes of $149 and $321, respectively (1,994) (168)
Net loss $ (3,186) $ (7,798)
Net loss per common share (Note 17):    
Basic net loss per common share from continuing operations (in usd per share) $ (0.07) $ (0.44)
Basic net loss per common share from discontinued operations (in usd per share) (0.11) (0.01)
Basic net loss per common share (in usd per share) (0.17) (0.45)
Diluted net loss per common share from continuing operations (in usd per share) (0.07) (0.44)
Diluted net loss per common share from discontinued operations (in usd per share) (0.11) (0.01)
Diluted net loss per common share (in usd per share) $ (0.17) $ (0.45)
Weighted average number of shares outstanding, basic (in shares) 18,289,839 17,504,190
Weighted average number of shares outstanding, diluted (in shares) 18,289,839 17,504,190