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BUSINESS SEGMENTS (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]    
Number of operating segments | segment 2  
Total revenues $ 77,165 $ 41,550
Depreciation 9,059 9,041
Loss from operations before equity income (9,047) (7,983)
Net equity income from foreign joint ventures’ operations 1,783 2,456
Income (loss) from operations (7,264) (5,527)
Interest expense, net 373 45
Interest expense, net - related parties 577 871
Income tax expense 808 256
Net income (loss) (7,798) (6,756)
Total assets 87,336 80,313
Brazil    
Segment Reporting Information [Line Items]    
Total revenues 7,994 5,260
Total assets 4,276 3,659
China    
Segment Reporting Information [Line Items]    
Total assets 12,325 11,897
Mexico    
Segment Reporting Information [Line Items]    
Total revenues 10,907 4,085
Total assets 7,716 5,307
United States    
Segment Reporting Information [Line Items]    
Total revenues 58,264 32,205
Total assets 63,019 59,450
LNG    
Segment Reporting Information [Line Items]    
Total revenues 69,171 36,290
Depreciation 8,894 8,911
Loss from operations before equity income (8,801) (6,532)
Net equity income from foreign joint ventures’ operations 0 0
Income (loss) from operations (8,801) (6,532)
Interest expense, net 324 26
Interest expense, net - related parties 577 871
Income tax expense 487 46
Net income (loss) (9,131) (7,567)
Total assets 70,735 64,757
Power Delivery    
Segment Reporting Information [Line Items]    
Total revenues 7,994 5,260
Depreciation 165 130
Loss from operations before equity income (246) (1,451)
Net equity income from foreign joint ventures’ operations 1,783 2,456
Income (loss) from operations 1,537 1,005
Interest expense, net 49 19
Interest expense, net - related parties 0 0
Income tax expense 321 210
Net income (loss) 1,333 811
Total assets $ 16,601 $ 15,556