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Business Segments (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
segment
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]              
Number of operating segments | segment         2    
Revenues $ 16,052   $ 5,003   $ 33,716 $ 18,841  
Depreciation 2,218   2,266   4,443 4,536  
Loss from operations before equity income (2,094)   (3,972)   (2,093) (4,594)  
Net equity income from foreign joint ventures' operations 475   948   829 774  
Income (loss) from operations (1,619)   (3,024)   (1,264) (3,820)  
Interest expense, net 77   15   94 26  
Interest expense, net - related parties 148   242   321 482  
Income tax expense (benefit) 183   169   263 210  
Net income (loss) (1,004) $ 175 (3,463) $ (1,050) (829) (4,513)  
Total assets 88,114       88,114   $ 80,313
LNG              
Segment Reporting Information [Line Items]              
Revenues 14,392   4,027   30,512 16,555  
Depreciation 2,181   2,234   4,369 4,469  
Loss from operations before equity income (1,840)   (3,531)   (1,572) (3,719)  
Net equity income from foreign joint ventures' operations 0   0   0 0  
Income (loss) from operations (1,840)   (3,531)   (1,572) (3,719)  
Interest expense, net 63   1   70 5  
Interest expense, net - related parties 148   242   321 482  
Income tax expense (benefit) 219   (35)   263 0  
Net income (loss) (1,247)   (3,740)   (1,232) (4,220)  
Total assets 72,413       72,413   64,757
Power Delivery              
Segment Reporting Information [Line Items]              
Revenues 1,660   976   3,204 2,286  
Depreciation 37   32   74 67  
Loss from operations before equity income (254)   (441)   (521) (875)  
Net equity income from foreign joint ventures' operations 475   948   829 774  
Income (loss) from operations 221   507   308 (101)  
Interest expense, net 14   14   24 21  
Interest expense, net - related parties 0   0   0 0  
Income tax expense (benefit) (36)   204   0 210  
Net income (loss) 243   $ 277   403 $ (293)  
Total assets $ 15,701       $ 15,701   $ 15,556
Bomay              
Segment Reporting Information [Line Items]              
Ownership percentage 40.00%       40.00%