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Condensed Consolidated Statements of Operations - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenues:    
Revenues $ 26,842 $ 20,267
Operating expenses:    
Cost of revenues 20,270 15,504
Change in unrealized loss on natural gas derivatives 169 0
Selling, general and administrative expenses 3,379 2,931
Gain from disposal of fixed assets 0 (80)
Depreciation expense 2,011 2,277
Total operating expenses 25,829 20,632
Income (loss) from operations before equity income 1,013 (365)
Net equity income from foreign joint venture operations:    
Income from equity investment in foreign joint venture 393 161
Foreign joint venture operating related expenses (48) (74)
Net equity income from foreign joint venture operations 345 87
Income (loss) from operations 1,358 (278)
Other income (expense):    
Interest expense, net (150) (137)
Interest expense, net - related parties (32) (31)
Other income (expense), net (84) (45)
Total other income (expense) (266) (213)
Net income (loss) from continuing operations before income tax benefit (expense) 1,092 (491)
Income tax benefit (expense) (8) 132
Net income (loss) from continuing operations 1,084 (359)
Loss from discontinued operations, net of income tax 0 (47)
Net income (loss) $ 1,084 $ (406)
Net income (loss) per common share (Note 13):    
Basic net income (loss) per common share from continuing operations (in usd per share) $ 0.06 $ (0.02)
Basic loss per common share from discontinued operations (in usd per share) 0 0
Basic net income (loss) per common share (in usd per share) 0.06 (0.02)
Diluted net income (loss) per common share from continuing operations (in usd per share) 0.06 (0.02)
Diluted loss per common share from discontinued operations (in usd per share) 0 0
Diluted net income (loss) per common share (in usd per share) $ 0.06 $ (0.02)