Consolidated Statements of Operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Revenues:
Revenues		$ 73,293	$ 73,114
Operating expenses:
Costs of revenues		52,069	54,919
Change in unrealized loss (gain) on natural gas derivatives	[1]	(310)	(541)
Selling, general and administrative expenses		11,763	12,893
Gain from disposal of fixed assets		(761)	(1,223)
Depreciation expense		7,146	7,878
Total operating expenses		69,907	73,926
Income (loss) from operations before equity income		3,386	(812)
Net equity income from foreign joint venture operations:
Income from equity investment in foreign joint venture		1,770	1,897
Foreign joint venture operating related expenses		(206)	(206)
Net equity income from foreign joint venture operations		1,564	1,691
Income from operations		4,950	879
Other income (expense):
Other income (expense)		22	(176)
Total other income (expense)		134	(510)
Net income before income tax expense		5,084	369
Income tax expense		485	244
Net income		$ 4,599	$ 125
Net income per common share (Note 16):
Basic and diluted per common share (in dollars per share)		$ 0.25	$ 0.01
Nonrelated Party [Member]
Other income (expense):
Interest income (expense), net		$ 112	$ (256)
Related Party [Member]
Other income (expense):
Interest income (expense), net		$ 0	$ (78)

[1] Amounts are presented on a gross basis.