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Business Segments (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
USD ($)
segment
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Segment Reporting Information [Line Items]      
Number of operating segments | segment 2    
Revenues $ 17,664 $ 13,838  
Depreciation 2,225 2,270  
Income (loss) from operations before equity income 1 (633)  
Net equity income from foreign joint ventures' operations 354 (174)  
Income from operations 355 (807)  
Interest expense, net 17 11  
Interest expense, net - related parties 173 240  
Income tax expense 80 41  
Net income (loss) 175 (1,050)  
Total assets 80,795   $ 80,313
LNG      
Segment Reporting Information [Line Items]      
Revenues 16,120 12,528  
Depreciation 2,188 2,235  
Income (loss) from operations before equity income 268 (199)  
Net equity income from foreign joint ventures' operations 0 0  
Income from operations 268 (199)  
Interest expense, net 7 4  
Interest expense, net - related parties 173 240  
Income tax expense 44 35  
Net income (loss) 15 (480)  
Total assets 65,233   64,757
Power Delivery      
Segment Reporting Information [Line Items]      
Revenues 1,544 1,310  
Depreciation 37 35  
Income (loss) from operations before equity income (267) (434)  
Net equity income from foreign joint ventures' operations 354 (174)  
Income from operations 87 (608)  
Interest expense, net 10 7  
Interest expense, net - related parties 0 0  
Income tax expense 36 6  
Net income (loss) 160 $ (570)  
Total assets $ 15,562   $ 15,556
Bomay      
Segment Reporting Information [Line Items]      
Ownership percentage 40.00%