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Consolidated Statements of Operations - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Revenues:    
Revenues $ 73,114 $ 98,823
Operating expenses:    
Costs of revenues 54,919 77,694
Change in unrealized loss (gain) on natural gas derivatives [1] (541) 878
Selling, general and administrative expenses 12,893 13,191
Gain from disposal of fixed assets (1,223) (34)
Depreciation expense 7,878 8,664
Total operating expenses 73,926 100,393
Loss from operations before equity income (812) (1,570)
Net equity income from foreign joint venture operations:    
Income from equity investment in foreign joint venture 1,897 1,881
Foreign joint venture operating related expenses (206) (283)
Net equity income from foreign joint venture operations 1,691 1,598
Income from operations 879 28
Other income (expense):    
Interest expense, net (509) (770)
Other income (expense) (176) (185)
Total other income (expense) (510) (955)
Income (loss) from continuing operations before income tax expense 369 (927)
Income tax expense 244 265
Net income (loss) from continuing operations 125 (1,192)
Loss from discontinued operations, net of income taxes of $0 and $149, respectively 0 (1,994)
Net income (loss) $ 125 $ (3,186)
Net income (loss) per common share:    
Basic income (loss) per common share from continuing operations (in dollars per share) $ 0.01 $ (0.07)
Basic loss per common share from discontinued operations (in dollars per share) 0 (0.11)
Basic net income (loss) per common share (in dollars per share) 0.01 (0.17)
Diluted income (loss) per common share from continuing operations (in dollars per share) 0.01 (0.07)
Diluted loss per common share from discontinued operations (in dollars per share) 0 (0.11)
Diluted net income (loss) per common share (in dollars per share) $ 0.01 $ (0.17)
Nonrelated Party [Member]    
Other income (expense):    
Interest expense, net $ (256) $ (591)
Related Party [Member]    
Other income (expense):    
Interest expense, net $ (78) $ (179)
[1] Amounts are presented as their own separate line item within the Company's Consolidated Statements of Operations.