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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Total revenues $ 17,338 $ 19,770
Operating expenses:    
Cost of revenues 12,788 13,514
Change in unrealized (gain) loss on natural gas derivatives (84) (252)
Selling, general and administrative expenses 4,933 3,456
Gain from disposal of fixed assets (103) (127)
Depreciation expense 1,867 1,800
Total operating expenses 19,401 18,391
Income (loss) from operations before equity income (2,063) 1,379
Net equity income from foreign joint venture operations:    
Income from equity investment in foreign joint venture 417 247
Foreign joint venture operating related expenses (49) (50)
Net equity income from foreign joint venture operations 368 197
Income (loss) from operations (1,695) 1,576
Other income (expense):    
Other income (expense), net (12) (21)
Total other income (expense) 9 (25)
Net income (loss) before income tax (benefit) expense (1,686) 1,551
Income tax (benefit) expense (88) 82
Net income (loss) $ (1,598) $ 1,469
Net income (loss) per common share (Note 11):    
Basic and diluted per common share (in dollars per share) $ (0.09) $ 0.08
Nonrelated Party [Member]    
Other income (expense):    
Interest income (expense), net $ 21 $ (4)