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Revised Unaudited Consolidated Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Electricity revenues	$ 52,966	$ 45,126
Cost of revenues	46,556	34,832
Gross profit	24,849	24,047
Net income	4,139	4,850
Net income attributable to Genie Energy, Ltd	4,582	5,669
Comprehensive income	4,581	6,107
Comprehensive income attributable to Genie Energy, Ltd	$ 5,282	$ 6,929
Earnings per share attributable to Genie Energy, Ltd. common stockholders:
Basic	$ 0.18	$ 0.23
Diluted	$ 0.18	$ 0.22
Prepaid Expense Error Correction [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Electricity revenues
Cost of revenues		817
Gross profit		(817)
Net income		(817)
Net income attributable to Genie Energy, Ltd		(817)
Comprehensive income		(817)
Comprehensive income attributable to Genie Energy, Ltd		$ (817)
Earnings per share attributable to Genie Energy, Ltd. common stockholders:
Basic		$ (0.04)
Diluted		$ (0.04)
Gross Receipts Tax Correction [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Electricity revenues		$ 741
Cost of revenues		741
Gross profit
Net income
Net income attributable to Genie Energy, Ltd
Comprehensive income
Comprehensive income attributable to Genie Energy, Ltd
Earnings per share attributable to Genie Energy, Ltd. common stockholders:
Basic
Diluted
Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Electricity revenues	$ 52,474	$ 44,385
Cost of revenues	45,819	33,274
Gross profit	23,621	24,864
Net income	3,034	5,667
Net income attributable to Genie Energy, Ltd	3,477	6,486
Comprehensive income	3,476	6,924
Comprehensive income attributable to Genie Energy, Ltd	$ 4,177	$ 7,746
Earnings per share attributable to Genie Energy, Ltd. common stockholders:
Basic	$ 0.13	$ 0.27
Diluted	$ 0.13	$ 0.26
Restated [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Electricity revenues	$ 52,966
Cost of revenues	46,556
Gross profit	24,849
Net income	4,139
Net income attributable to Genie Energy, Ltd	4,582
Comprehensive income	4,581
Comprehensive income attributable to Genie Energy, Ltd	$ 5,282
Earnings per share attributable to Genie Energy, Ltd. common stockholders:
Basic	$ 0.18
Diluted	$ 0.18

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