Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 2,541	$ 2,060
Accounts receivable, net	8,890	10,323
Inventories, net	327	386
Prepaid expenses and other current assets	3,623	2,764
Total current assets	15,381	15,533
Property, plant and equipment:
Cost	103,407	101,827
Less accumulated depreciation	(49,515)	(47,140)
Property, plant and equipment, net	53,892	54,687
Goodwill	4,453	4,453
Investments in foreign joint ventures	12,524	12,325
Right-of-use assets and other noncurrent assets	353	338
Total assets	86,603	87,336
Current liabilities:
Accounts payable	5,228	5,556
Accrued liabilities	7,411	7,613
Current portion of long-term notes payable	883	963
Current portion of long-term notes payable - related parties	1,103	1,168
Current portion of finance and operating lease obligations	310	327
Total current liabilities	14,935	15,627
Long-term notes payable, net of current portion	7,788	7,753
Long-term notes payable, net of current portion - related parties	1,839	2,435
Long-term portion of finance and operating lease obligations	390	393
Other noncurrent liabilities	90	69
Total liabilities	25,042	26,277
Commitments and contingencies (Note 10)
Stockholders’ Equity:
Preferred Stock; $0.001 par value, 1,000,000 shares authorized, no shares issued and outstanding at March 31, 2022 and December 31, 2021	0	0
Common stock; $0.001 par value, 37,500,000 shares authorized, 18,192,602 and 17,691,268 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively	18	18
Additional paid-in capital	98,406	97,875
Accumulated other comprehensive income	728	351
Accumulated deficit	(37,591)	(37,185)
Total stockholders’ equity	61,561	61,059
Total liabilities and stockholders’ equity	$ 86,603	$ 87,336