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Investment in Shoreditch Energy Limited (Details Textual) - USD ($) $ in Millions	1 Months Ended		9 Months Ended
	Sep. 17, 2018	Aug. 31, 2018	Sep. 30, 2018
Investment in Shoreditch Energy Limited (Textual)
Description of joint venture agreement		The parties confirmed that the relevant conditions described in the JV Agreement were satisfied, triggering additional funding obligations, albeit at a lower level than in the JV Agreement due to the revised budgets and forecasts. In September 2018, the Company contributed $0.7 million to Shoreditch, which increased GEUK's total contribution to $4.7 million as of September 30, 2018. In January 2019, GEUK is obligated to contribute an additional £0.5 million ($0.7 million at September 30, 2018) and EGC is obligated to contribute £0.4 million ($0.5 million at September 30, 2018), to Shoreditch in January 2019. In connection with the revised contributions and obligations, the GEUK's ownership of Shoreditch increased from 65% to 67% and EGC's ownership reduced from 35% to 33% as of September 30, 2018.
Outstanding balance, including accrued interest		$ 0.1
Shoreditch [Member]
Investment in Shoreditch Energy Limited (Textual)
Net book value of investments			$ 2.0
EGC [Member]
Investment in Shoreditch Energy Limited (Textual)
Loan amount	$ 0.1
Annual interest rate	2.00%
Due date	Sep. 17, 2023
Outstanding balance, including accrued interest			$ 0.1

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