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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenues:        
Revenues $ 12,907 $ 23,150 $ 39,749 $ 43,417
Operating expenses:        
Cost of revenues 10,585 19,537 30,855 35,041
Change in unrealized loss on natural gas derivatives (224) 899 (55) 899
Selling, general and administrative expenses 3,043 3,054 6,422 5,985
Gain from disposal of fixed assets 0 0 0 (80)
Depreciation expense 1,992 2,197 4,003 4,474
Total operating expenses 15,396 25,687 41,225 46,319
Income (loss) from operations before equity income (2,489) (2,537) (1,476) (2,902)
Net equity income from foreign joint venture operations:        
Income from equity investment in foreign joint venture 741 760 1,134 921
Foreign joint venture operating related expenses (56) (74) (104) (148)
Net equity income from foreign joint venture operations 685 686 1,030 773
Income (loss) from operations (1,804) (1,851) (446) (2,129)
Other income (expense):        
Other income (expense), net (40) (26) (124) (71)
Total other income (expense) (211) (225) (477) (438)
Net loss from continuing operations before income tax (benefit) expense (2,015) (2,076) (923) (2,567)
Income tax expense (benefit) 159 (1) 167 (133)
Net loss from continuing operations (2,174) (2,075) (1,090) (2,434)
Loss from discontinued operations, net of income tax 0 (93) 0 (140)
Net loss $ (2,174) $ (2,168) $ (1,090) $ (2,574)
Net loss per common share:        
Basic and diluted per common share from continuing operations (in dollars per share) $ (0.12) $ (0.11) $ (0.06) $ (0.13)
Basic and diluted per common share from discontinued operations (in dollars per share) 0 (0.01) 0 (0.01)
Basic and diluted per common share (in dollars per share) $ (0.12) $ (0.12) $ (0.06) $ (0.14)
Weighted average number of common shares outstanding:        
Basic and diluted (in shares) 18,464,929 18,253,066 18,445,775 18,222,426
Nonrelated Party [Member]        
Other income (expense):        
Interest expense, net $ (147) $ (150) $ (297) $ (287)
Related Party [Member]        
Other income (expense):        
Interest expense, net $ (24) $ (49) $ (56) $ (80)