Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 8,987	$ 5,374
Accounts receivable, net	6,239	7,752
Inventories, net	345	169
Prepaid expenses and other current assets	1,902	1,677
Total current assets	17,473	14,972
Property, plant and equipment:
Cost	117,246	110,646
Less: accumulated depreciation	(65,518)	(61,167)
Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization	51,728	49,479
Goodwill	4,314	4,314
Investments in foreign joint ventures	11,659	12,009
Right of Use Assets and Other Assets, Noncurrent	410	525
Total assets	85,584	81,299
Liabilities, Current [Abstract]
Accounts payable	5,667	5,707
Accrued liabilities	3,566	4,166
Finance Lease and Operating Lease, Liability, Current	384	164
Total current liabilities	11,627	11,719
Long-term notes payable, net of current portion and debt issuance costs	6,848	7,747
Long-term portion of operating lease obligations	101	21
Total liabilities	18,576	19,487
Commitments and contingencies
Stockholders’ Equity:
Common stock; $0.001 par value, 37,500,000 shares authorized, 18,585,014 and 18,573,391 shares issued and outstanding at December 31, 2024 and December 31, 2023, respectively	19	19
Additional paid-in capital	103,214	102,057
Accumulated other comprehensive loss	(578)	(18)
Accumulated deficit	(35,647)	(40,246)
Total stockholders' equity	67,008	61,812
Total liabilities and stockholders' equity	85,584	81,299
Nonrelated Party [Member]
Liabilities, Current [Abstract]
Current portion of long-term notes payable	$ 2,010	$ 1,682