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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Total revenues $ 18,598 $ 12,907 $ 38,368 $ 39,749
Operating expenses:        
Cost of revenues 13,550 10,585 27,064 30,855
Change in unrealized (gain) loss on natural gas derivatives [1] (82) (224) (334) (55)
Selling, general and administrative expenses 3,331 3,043 6,787 6,422
Gain from disposal of fixed assets (72) 0 (199) 0
Depreciation expense 1,768 1,992 3,568 4,003
Total operating expenses 18,495 15,396 36,886 41,225
Income (loss) from operations before equity income 103 (2,489) 1,482 (1,476)
Net equity income from foreign joint venture operations:        
Income from equity investment in foreign joint venture 340 741 587 1,134
Foreign joint venture operating related expenses (45) (56) (95) (104)
Net equity income from foreign joint venture operations 295 685 492 1,030
Income (loss) from operations 398 (1,804) 1,974 (446)
Other income (expense):        
Other (expense), net 26 (40) 5 (124)
Total other income (expense) 54 (211) 29 (477)
Net income (loss) before income tax expense 452 (2,015) 2,003 (923)
Income tax expense 425 159 507 167
Net income (loss) $ 27 $ (2,174) $ 1,496 $ (1,090)
Net income (loss) per common share (Note 12):        
Basic and diluted per common share (in dollars per share) $ 0 $ (0.12) $ 0.08 $ (0.06)
Nonrelated Party [Member]        
Other income (expense):        
Interest income (expense), net $ 28 $ (147) $ 24 $ (297)
Related Party [Member]        
Other income (expense):        
Interest income (expense), net $ 0 $ (24) $ 0 $ (56)
[1] Amounts are presented on a gross basis.