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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Total revenues $ 17,627 $ 15,316 $ 55,995 $ 55,065
Operating expenses:        
Cost of revenues 12,638 12,056 39,702 42,911
Change in unrealized (gain) loss on natural gas derivatives [1] 13 (267) (321) (322)
Selling, general and administrative expenses 3,035 3,002 9,822 9,424
Gain from disposal of fixed assets (102) (1,002) (301) (1,002)
Depreciation expense 1,776 2,003 5,344 6,006
Total operating expenses 17,360 15,792 54,246 57,017
Income (loss) from operations before equity income 267 (476) 1,749 (1,952)
Net equity income from foreign joint venture operations:        
Income from equity investment in foreign joint venture 575 332 1,162 1,466
Foreign joint venture operating related expenses (59) (48) (154) (152)
Net equity income from foreign joint venture operations 516 284 1,008 1,314
Income (loss) from operations 783 (192) 2,757 (638)
Other income (expense):        
Other income (expense), net 10 (3) 15 (127)
Total other income (expense) 91 42 120 (435)
Net income (loss) before income tax (benefit) expense 874 (150) 2,877 (1,073)
Income tax (benefit) expense (123) 57 384 224
Net income (loss) $ 997 $ (207) $ 2,493 $ (1,297)
Net income (loss) per common share (Note 12):        
Basic and diluted per common share (in dollars per share) $ 0.05 $ (0.01) $ 0.13 $ (0.07)
Nonrelated Party [Member]        
Other income (expense):        
Interest income (expense), net $ 81 $ 60 $ 105 $ (237)
Related Party [Member]        
Other income (expense):        
Interest income (expense), net $ 0 $ (15) $ 0 $ (71)
[1] Amounts are presented on a gross basis.