Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Total revenues	$ 17,309	$ 18,598	$ 34,647	$ 38,368
Operating expenses:
Cost of revenues	12,724	13,550	25,512	27,064
Change in unrealized (gain) loss on natural gas derivatives	60	(82)	(24)	(334)
Selling, general and administrative expenses	3,131	3,331	8,064	6,787
Gain from disposal of fixed assets	0	(72)	(103)	(199)
Depreciation expense	1,860	1,768	3,727	3,568
Total operating expenses	17,775	18,495	37,176	36,886
Income (loss) from operations before equity income	(466)	103	(2,529)	1,482
Net equity income from foreign joint venture operations:
Income from equity investment in foreign joint venture	120	340	537	587
Foreign joint venture operating related expenses	(70)	(45)	(119)	(95)
Net equity income from foreign joint venture operations	50	295	418	492
Income (loss) from operations	(416)	398	(2,111)	1,974
Other income (expense):
Other income (expense), net	(24)	26	(36)	5
Total other income (expense)	0	54	9	29
Net income (loss) before income tax expense	(416)	452	(2,102)	2,003
Income tax expense	197	425	109	507
Net income (loss)	$ (613)	$ 27	$ (2,211)	$ 1,496
Net income (loss) per common share:
Basic and diluted per common share (in dollars per share)	$ (0.03)	$ 0	$ (0.12)	$ 0.08
Nonrelated Party [Member]
Other income (expense):
Interest income (expense), net	$ 24	$ 28	$ 45	$ 24