Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 12,220	$ 8,987
Accounts receivable, net	4,397	6,239
Inventories, net	180	345
Prepaid expenses and other current assets	1,039	1,902
Total current assets	17,836	17,473
Property, plant and equipment:
Cost	118,596	117,246
Less: accumulated depreciation	(69,048)	(65,518)
Property, Plant and Equipment, Net	49,548	51,728
Goodwill	4,314	4,314
Investments in foreign joint ventures	10,760	11,659
Right-of-use assets and other noncurrent assets	786	410
Total assets	83,244	85,584
Current liabilities:
Accounts payable	5,950	5,667
Accrued liabilities	3,456	3,566
Current portion of finance and operating lease obligations	640	384
Total current liabilities	11,341	11,627
Long-term notes payable, net of current portion and debt issuance costs	6,336	6,848
Long-term portion of operating lease obligations	85	101
Total liabilities	17,762	18,576
Commitments and contingencies (Note 9)
Stockholders’ equity:
Preferred stock; $0.001 par value, 1,000,000 shares authorized, no shares issued and outstanding at June 30, 2025 and December 31, 2024	0	0
Common stock; $0.001 par value, 37,500,000 shares authorized, 18,596,301 and 18,585,014 shares issued and outstanding at June 30, 2025 and December 31, 2024, respectively	19	19
Additional paid-in capital	103,644	103,214
Accumulated other comprehensive loss	(323)	(578)
Accumulated deficit	(37,858)	(35,647)
Total stockholders’ equity	65,482	67,008
Total liabilities and stockholders’ equity	83,244	85,584
Nonrelated Party [Member]
Current liabilities:
Current portion of long-term notes payable	$ 1,295	$ 2,010