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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Revenues:    
Revenues $ 19,770 $ 26,842
Operating expenses:    
Cost of revenues 13,514 20,270
Change in unrealized (gain) loss on natural gas derivatives (252) 169
Selling, general and administrative expenses 3,456 3,379
Gain from disposal of fixed assets (127) 0
Depreciation expense 1,800 2,011
Total operating expenses 18,391 25,829
Income from operations before equity income 1,379 1,013
Net equity income from foreign joint venture operations:    
Income from equity investment in foreign joint venture 247 393
Foreign joint venture operating related expenses (50) (48)
Net equity income from foreign joint venture operations 197 345
Income from operations 1,576 1,358
Other income (expense):    
Other (expense), net (21) (84)
Total other income (expense) (25) (266)
Net income before income tax expense 1,551 1,092
Income tax expense 82 8
Net Income $ 1,469 $ 1,084
Net income per common share (Note 11):    
Basic net income per common share (in dollars per share) $ 0.08 $ 0.06
Diluted net income per common share (in dollars per share) $ 0.08 $ 0.06
Nonrelated Party [Member]    
Other income (expense):    
Interest income (expense), net $ (4) $ (150)
Related Party [Member]    
Other income (expense):    
Interest income (expense), net $ 0 $ (32)