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Business Segments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information [Line Items]      
Number of operating segments | segment 2    
Total revenues $ 41,550 $ 47,071  
Depreciation 9,041 9,271  
Loss from operations before equity income (8,266) (5,430)  
Net equity income from foreign joint ventures’ operations 2,456 1,133  
Income (loss) from operations (5,810) (4,297)  
Interest expense, net 45 33  
Interest expense, net - related parties 871 1,175  
Income tax expense 256 116  
Net income (loss) (6,756) (5,508) $ (10,837)
Total assets 80,313 90,326  
Brazil      
Segment Reporting Information [Line Items]      
Total revenues 5,260 3,421  
Total assets 3,659 3,276  
China      
Segment Reporting Information [Line Items]      
Total assets 11,897 11,167  
Mexico      
Segment Reporting Information [Line Items]      
Total revenues 4,085 131  
Total assets 5,307 4,916  
United States      
Segment Reporting Information [Line Items]      
Total revenues 32,205 43,519  
Total assets 59,450 70,967  
LNG      
Segment Reporting Information [Line Items]      
Total revenues 36,290 43,650  
Depreciation 8,911 9,127  
Loss from operations before equity income (6,815) (5,016)  
Net equity income from foreign joint ventures’ operations 0 0  
Income (loss) from operations (6,815) (5,016)  
Interest expense, net 26 19  
Interest expense, net - related parties 871 1,175  
Income tax expense 46 38  
Net income (loss) (7,567) (6,194)  
Total assets 64,757 75,883  
Power Delivery      
Segment Reporting Information [Line Items]      
Total revenues 5,260 3,421  
Depreciation 130 144  
Loss from operations before equity income (1,451) (414)  
Net equity income from foreign joint ventures’ operations 2,456 1,133  
Income (loss) from operations 1,005 719  
Interest expense, net 19 14  
Interest expense, net - related parties 0 0  
Income tax expense 210 78  
Net income (loss) 811 686  
Total assets $ 15,556 $ 14,443  
Bomay      
Segment Reporting Information [Line Items]      
Ownership percentage 40.00%