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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Total revenues $ 20,325 $ 17,627 $ 54,972 $ 55,995
Operating expenses:        
Cost of revenues 14,723 12,638 40,235 39,702
Change in unrealized loss (gain) on natural gas derivatives 19 13 (5) (321)
Selling, general and administrative expenses 2,783 3,035 10,847 9,822
Loss (gain) from disposal of fixed assets 165 (102) 62 (301)
Depreciation expense 1,842 1,776 5,569 5,344
Total operating expenses 19,532 17,360 56,708 54,246
Income (loss) from operations before equity income 793 267 (1,736) 1,749
Net equity income from foreign joint venture operations:        
Income from equity investment in foreign joint venture 322 575 859 1,162
Foreign joint venture operating related expenses (44) (59) (163) (154)
Net equity income from foreign joint venture operations 278 516 696 1,008
Income (loss) from operations 1,071 783 (1,040) 2,757
Other income (expense):        
Other income (expense), net (35) 10 (71) 15
Total other income 49 91 58 120
Net income (loss) before income tax expense 1,120 874 (982) 2,877
Income tax expense (benefit) 1 (123) 110 384
Net income (loss) $ 1,119 $ 997 $ (1,092) $ 2,493
Net income (loss) per common share:        
Basic and diluted per common share (in dollars per share) $ 0.06 $ 0.05 $ (0.06) $ 0.13
Nonrelated Party [Member]        
Other income (expense):        
Interest income, net $ 84 $ 81 $ 129 $ 105