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Business Segments (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
segment
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]                  
Number of operating segments | segment             2    
Revenues $ 19,704     $ 9,019     $ 53,420 $ 27,860  
Depreciation 2,324     2,266     6,767 6,802  
Loss from operations before equity income (4,598)     (2,433)     (6,691) (7,027)  
Net equity income from foreign joint ventures' operations 246     573     1,075 1,347  
Income (loss) from operations (4,352)     (1,860)     (5,616) (5,680)  
Interest expense, net 130     2     224 28  
Interest expense, net - related parties 120     199     441 681  
Income tax expense 93     41     356 251  
Net income (loss) (4,625) $ (1,004) $ 175 (2,133) $ (3,463) $ (1,050) (5,454) (6,646)  
Total assets 87,669           87,669   $ 80,313
LNG                  
Segment Reporting Information [Line Items]                  
Revenues 17,779     7,667     48,291 24,222  
Depreciation 2,284     2,237     6,653 6,706  
Loss from operations before equity income (4,441)     (2,179)     (6,013) (5,898)  
Net equity income from foreign joint ventures' operations 0     0     0 0  
Income (loss) from operations (4,441)     (2,179)     (6,013) (5,898)  
Interest expense, net 118     11     188 16  
Interest expense, net - related parties 120     199     441 681  
Income tax expense 93     41     356 41  
Net income (loss) (4,735)     (2,458)     (5,967) (6,678)  
Total assets 71,450           71,450   64,757
Power Delivery                  
Segment Reporting Information [Line Items]                  
Revenues 1,925     1,352     5,129 3,638  
Depreciation 40     29     114 96  
Loss from operations before equity income (157)     (254)     (678) (1,129)  
Net equity income from foreign joint ventures' operations 246     573     1,075 1,347  
Income (loss) from operations 89     319     397 218  
Interest expense, net 12     (9)     36 12  
Interest expense, net - related parties 0     0     0 0  
Income tax expense 0     0     0 210  
Net income (loss) 110     $ 325     513 $ 32  
Total assets $ 16,219           $ 16,219   $ 15,556
Bomay                  
Segment Reporting Information [Line Items]                  
Ownership percentage 40.00%           40.00%