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Business Segments (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2022
USD ($)
segment
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Segment Reporting [Abstract]              
Number of operating segments | segment         2    
Segment Reporting Information [Line Items]              
Revenues $ 25,784   $ 16,052   $ 48,817 $ 33,716  
Depreciation 2,263   2,218   4,585 4,443  
Income (loss) from operations before equity income (2,420)   (2,094)   (2,812) (2,093)  
Net equity income from foreign joint ventures' operations 686   475   773 829  
Income (loss) from operations (1,734)   (1,619)   (2,039) (1,264)  
Interest income (expense), net (164)   (77)   (318) (94)  
Interest expense, net - related parties (49)   (148)   (80) (321)  
Income tax expense (benefit) 191   183   62 263  
Net income (loss) (2,168) $ (406) (1,004) $ 175 (2,574) (829)  
Total assets 87,107       87,107   $ 87,336
LNG              
Segment Reporting Information [Line Items]              
Revenues 23,150   14,392   43,417 30,512  
Depreciation 2,197   2,181   4,474 4,369  
Income (loss) from operations before equity income (2,469)   (1,840)   (2,764) (1,572)  
Net equity income from foreign joint ventures' operations 0   0   0 0  
Income (loss) from operations (2,469)   (1,840)   (2,764) (1,572)  
Interest income (expense), net (150)   (63)   (287) (70)  
Interest expense, net - related parties (49)   (148)   (80) (321)  
Income tax expense (benefit) (1)   219   (133) 263  
Net income (loss) (2,693)   (1,247)   (3,069) (1,232)  
Total assets 71,512       71,512   70,735
Power Delivery              
Segment Reporting Information [Line Items]              
Revenues 2,634   1,660   5,400 3,204  
Depreciation 66   37   111 74  
Income (loss) from operations before equity income 49   (254)   (48) (521)  
Net equity income from foreign joint ventures' operations 686   475   773 829  
Income (loss) from operations 735   221   725 308  
Interest income (expense), net (14)   (14)   (31) (24)  
Interest expense, net - related parties 0   0   0 0  
Income tax expense (benefit) 192   (36)   195 0  
Net income (loss) 525   $ 243   495 $ 403  
Total assets $ 15,595       $ 15,595   $ 16,601