Business Segments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | segment	2
Total revenues	$ 13,838		$ 12,975
Depreciation	2,270		2,290
Loss from operations before equity income	(633)		(203)
Net equity income from foreign joint ventures' operations	(174)	$ (1,100)	0
Loss from operations	(807)		(203)
Net loss	(1,050)		(559)
Total Assets	85,745	90,326
LNG
Segment Reporting Information [Line Items]
Total revenues	12,528		12,975
Depreciation	2,235		2,290
Loss from operations before equity income	(199)		(203)
Net equity income from foreign joint ventures' operations	0
Loss from operations	(199)
Net loss	(480)		(559)
Total Assets	72,647	75,883
Power Delivery
Segment Reporting Information [Line Items]
Total revenues	1,310		0
Depreciation	35		0
Loss from operations before equity income	(434)		0
Net equity income from foreign joint ventures' operations	(174)
Loss from operations	(608)
Net loss	(570)		$ 0
Total Assets	$ 13,098	$ 14,443
Bomay
Segment Reporting Information [Line Items]
Ownership percentage	40.00%