Genie Energy (GNE) 10-K 19 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Mar. 15, 2019	Jun. 30, 2018
Entity Registrant Name	Genie Energy Ltd.
Entity Central Index Key	0001528356
Trading Symbol	GNE
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Entity Filer Category	Accelerated Filer
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Shell Company	false
Entity Current Reporting Status	Yes
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Ex Transition Period	false
Entity Public Float			$ 82.4
Class A common stock
Entity Common Stock, Shares Outstanding		1,574,326
Class B common stock
Entity Common Stock, Shares Outstanding		25,517,003

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 41,601	$ 29,913
Trade accounts receivable, net of allowance for doubtful accounts of $2,003 and $1,099 at December 31, 2018 and 2017, respectively	35,920	44,629
Inventory	9,893	3,986
Prepaid expenses	6,167	6,131
Other current assets	4,323	5,503
TOTAL CURRENT ASSETS	97,904	90,162
Property and equipment, net	4,301	4,020
Goodwill	11,082	9,998
Other intangibles, net	6,321	4,859
Investment in equity method investees	2,208	3,450
Restricted cash - long-term	943	1,496
Deferred income tax assets, net	15,625	2,141
Other assets	8,480	9,652
TOTAL ASSETS	146,864	125,778
CURRENT LIABILITIES:
Notes payable	923
Trade accounts payable	18,508	21,068
Accrued expenses	25,242	28,069
Income taxes payable	1,463	2,204
Due to IDT Corporation	234	228
Other current liabilities	4,416	3,172
TOTAL CURRENT LIABILITIES	50,786	54,741
Revolving line of credit	2,516	2,513
Other liabilities	900	1,396
TOTAL LIABILITIES	54,202	58,650
Commitments and contingencies (Note 15 and Note 16)
Genie Energy Ltd. Stockholders' equity:
Preferred stock, $0.01 par value; authorized shares - 10,000: Series 2012-A, designated shares - 8,750; at liquidation preference, consisting of 2,322 shares issued and outstanding at December 31, 2018 and 2017	19,743	19,743
Additional paid-in capital	136,629	130,870
Treasury stock, at cost, consisting of 250 and 331 shares of Class B common at December 31, 2018 and 2017, respectively	(1,624)	(2,428)
Accumulated other comprehensive income	2,591	3,045
Accumulated deficit	(53,939)	(67,469)
Total Genie Energy Ltd. Stockholders' equity	103,671	84,013
Noncontrolling interests:
Noncontrolling interests	(11,009)	(16,885)
TOTAL EQUITY	92,662	67,128
TOTAL LIABILITIES AND EQUITY	146,864	125,778
Class A common stock
Genie Energy Ltd. Stockholders' equity:
Common stock, value	16	16
Noncontrolling interests:
TOTAL EQUITY	16	16
Class B common stock
Genie Energy Ltd. Stockholders' equity:
Common stock, value	255	236
Noncontrolling interests:
TOTAL EQUITY	$ 255	$ 236

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful accounts, trade accounts receivable (in dollars)	$ 2,003	$ 1,099
Preferred stock, par value (In dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000	10,000
Series 2012-A Preferred Stock
Designated shares	8,750	8,750
Preferred stock, shares issued	2,322	2,322
Preferred stock, shares outstanding	2,322	2,322
Class A common stock
Common stock, par value (In dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	35,000	35,000
Common stock, shares issued	1,574	1,574
Common stock, shares outstanding	1,574	1,574
Class B common stock
Common stock, par value (In dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	25,544	23,601
Common stock, shares outstanding	25,294	23,270
Treasury stock, shares	250	331

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
REVENUES:
Electricity	$ 227,883	$ 222,171
Natural gas	46,560	40,098
Other	5,866	1,933
Total revenues	280,309	264,202
Cost of revenues	203,762	178,693
GROSS PROFIT	76,547	85,509
OPERATING EXPENSES AND LOSSES:
Selling, general and administrative	61,583	80,122
Exploration	244	4,879
Write-off of capitalized exploration costs		6,483
Impairment of assets (Note 2)	2,742
Income (loss) from operations	11,978	(5,975)
Interest income	557	295
Interest expense	(401)	(310)
Equity in the net loss in equity method investees	(3,430)	(565)
Gain on extinguishment of liability	164
Other income (expense), net	156	(367)
Income (loss) before income taxes	9,024	(6,922)
Benefit from (provision for) income taxes	(12,376)	(1,726)
NET INCOME (LOSS)	21,400	(8,648)
Net loss attributable to noncontrolling interests	1,385	1,654
NET INCOME (LOSS) ATTRIBUTABLE TO GENIE ENERGY LTD.	22,785	(6,994)
Dividends on preferred stock	(1,481)	(1,481)
NET INCOME (LOSS) ATTRIBUTABLE TO GENIE ENERGY LTD. COMMON STOCKHOLDERS	$ 21,304	$ (8,475)
Earnings (loss) per share attributed to Genie Energy Ltd. common stockholder
Basic	$ 0.85	$ (0.36)
Diluted	$ 0.83	$ (0.36)
Weighted-average number of shares used in calculation of earnings (loss) per share
Basic	25,154	23,531
Diluted	25,695	23,531
Dividends declared per common share	$ 0.30	$ 0.30

Consolidated Statements of Op_2

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements of Operations [Abstract]
Stock-based compensation included in selling, general and administrative expenses	$ 4,523	$ 5,213

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statements of Comprehensive (Loss) Income [Abstract]
NET INCOME (LOSS)	$ 21,400	$ (8,648)
Other comprehensive income:
Foreign currency translation adjustments	3	917
COMPREHENSIVE INCOME (LOSS)	21,403	(7,731)
Comprehensive loss attributable to noncontrolling interests	930	2,317
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO GENIE ENERGY LTD.	$ 22,333	$ (5,414)

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	Total	Class A common stock	Class B common stock	Preferred Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income	Accumulated Deficit	Noncontrolling Interests	Receivable for issuance of equity
Beginning Balance at Dec. 31, 2016	$ 79,865	$ 16	$ 233	$ 19,743	$ 128,243	$ (1,599)	$ 1,465	$ (51,567)	$ (15,002)	$ (1,667)
Beginning Balance, Shares at Dec. 31, 2016		1,574	23,274	2,322
Dividends on preferred stock	(1,481)							(1,481)
Dividends on common stock	(7,427)							(7,427)
Restricted Class B common stock purchased from employees	(829)					(829)
Stock-based compensation	3,090				3,090
Stock-based compensation, Shares			24
Exercise of stock options	108				108
Exercise of stock options, Shares			16
Purchases of equity of subsidiary	(312)				(746)				434
Class B common stock issued for GRE deferred stock units	1,845		$ 3		1,842
Class B common stock issued for GRE deferred stock units, Shares			287
Receivable for issuance of equity of subsidiary written-off					(1,667)					1,667
Other comprehensive income	917						1,580		(663)
Net loss for the year ended	(8,648)							(6,994)	(1,654)
Ending Balance at Dec. 31, 2017	67,128	$ 16	$ 236	$ 19,743	130,870	(2,428)	3,045	(67,469)	(16,885)
Ending Balance, Shares at Dec. 31, 2017		1,574	23,601	2,322
Dividends on preferred stock	(1,481)							(1,481)
Dividends on common stock	(7,774)							(7,774)
Restricted Class B common stock purchased from employees	(889)					(889)
Stock-based compensation	3,725		$ 4		3,721
Stock-based compensation, Shares			439
Sale of Class B common stock and warrants	6,000		$ 12		4,295	1,693
Sale of Class B common stock and warrants, Shares			1,152
Purchases of equity of subsidiary					(4,140)				4,140
Purchases of equity of subsidiary, Shares			42
Class B common stock issued for GRE deferred stock units	1,886		$ 3		1,883
Class B common stock issued for GRE deferred stock units, Shares			310
Noncontrolling interest from acquisition of Prism	2,667								2,667
Other comprehensive income							(454)		454
Net loss for the year ended	21,400							22,785	(1,385)
Ending Balance at Dec. 31, 2018	$ 92,662	$ 16	$ 255	$ 19,743	$ 136,629	$ (1,624)	$ 2,591	$ (53,939)	$ (11,009)
Ending Balance, Shares at Dec. 31, 2018		1,574	25,544	2,322

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends on common stock	$ 0.30	$ 0.30

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES
Net income (loss)	$ 21,400	$ (8,648)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	2,062	2,140
Deferred income taxes	(13,483)	(360)
Provision for doubtful accounts receivable	904	762
Stock-based compensation	4,523	5,213
Gain on sale disposal of property and equipment	(18)
Gain on extinguishment of liability	(164)
Write-off of capitalized exploration costs		6,483
Impairment of assets	2,742
Equity in the net loss of equity method investees	3,430	565
Change in assets and liabilities, net of effect of acquisition:
Trade accounts receivable	7,817	(8,024)
Inventory	(4,764)	2,003
Prepaid expenses	219	(2,027)
Other current assets and other assets	2,726	(3,703)
Trade accounts payable, accrued expenses and other current liabilities	(7,299)	15,110
Due to IDT Corporation	20	88
Income taxes payable	(741)	(222)
Net cash provided by operating activities	19,374	9,380
INVESTING ACTIVITIES
Capital expenditures	(584)	(3,292)
Investments in capitalized exploration costs - unproved oil and gas property		(5,531)
Proceeds from disposal of property	62
Payment for acquisition of license in Japan	(745)
Cash transferred to Atid	(209)
Payment for acquisition, net of cash acquired	(250)	(4,180)
Repayment of notes receivable	94	445
Investments in equity method investees	(1,306)	(3,970)
Net cash used in investing activities	(2,938)	(16,528)
FINANCING ACTIVITIES
Dividends paid	(9,256)	(8,908)
Purchases of equity of subsidiary		(312)
Proceeds from revolving line of credit and loan payable		14,450
Repayment of revolving line of credit and loan payable		(12,655)
Repayment of notes payable	(10)
Proceeds from exercise of stock options		108
Proceeds from sales of Class B common stock and warrants	6,000
Repurchases of Class B common stock from employees	(889)	(829)
Net cash used in financing activities	(4,155)	(8,146)
Cash and cash equivalents at beginning of year	31,927	47,052
Cash and cash equivalents at end of year	44,197	31,927
Effect of exchange rate changes on cash and cash equivalents	(11)	169
Net increase (decrease) in cash and cash equivalents	12,270	(15,125)
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION
Cash payments made for interest	400	310
Cash payments made for income taxes	1,771	2
SUPPLEMENTAL SCHEDULE OF NON-CASH FINANCING AND INVESTING ACTIVITIES
Class B common stock issued for GRE deferred stock units	1,886	1,845
Receivable for issuance of equity written-off		1,667
Purchase of equity of subsidiary (Note 12)	(4,140)
Carrying value of assets contributed to New Atid (Note 2)	$ 1,000

Description of Business and Sum

Description of Business and Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Description of Business and Summary of Significant Accounting Policies [Abstract]
Description of Business and Summary of Significant Accounting Policies	Note 1 Description of Business Genie Energy Ltd. (“Genie”), a Delaware corporation, was incorporated in January 2011. Genie owns 99.3 100 100 60 % of Prism Solar Technology, . ("Prism") 97 Genie, owns and operates retail energy providers (“REPs”), including IDT Energy, Inc. (“IDT Energy”), Residents Energy, LLC (“Residents Energy”), Town Square Energy (“TSE”), and Mirabito Natural Gas (“Mirabito”). Its REP businesses resell electricity and natural gas to residential and small business customers in the Eastern and Midwestern United States. Internationally, GRE manages our interest in joint venture that serves retail customers customers in the United Kingdom ('U. K.") and our venture in Japan recently launched commercial operations (see Note 2 6 GES oversees LLC (" "), a retail energy advisory and brokerage company that serves commercial and industrial customers throughout the United States ("U.S.") and manages 60 Prism (see Note 2 GOGAS is an oil and gas exploration company and owns an interest in a contracted drilling services operation. 86.1 GOGAS also holds controlling interests in inactive oil and gas projects. Until September 2018, GOGAS owned 37.5 2 As of December 31, 2018, Genie Retail Energy International, LLC ("GREI"), 4.0 % and 4.5 2020 Seasonality and Weather The weather and the seasons, among other things, affect GRE’s REPs’ revenues. Weather conditions have a significant impact on the demand for natural gas used for heating and electricity used for heating and cooling. Typically, colder winters increase demand for natural gas and electricity, and hotter summers increase demand for electricity. Milder winters and/or summers have the opposite effect. Natural gas revenues typically increase in the first quarter due to increased heating demands and electricity revenues typically increase in the third quarter due to increased air conditioning use. Approximately 50 45 2018 2017 30 2018 2017 Basis of Consolidation The method of accounting applied to long-term investments, whether consolidated, equity or cost, involves an evaluation of the significant terms of each investment that explicitly grant or suggest evidence of control or influence over the operations of the investee and also includes the identification of any variable interests in which the Company is the primary beneficiary. The consolidated financial statements include the Company’s controlled subsidiaries and the variable interest entity in which the Company is the primary beneficiary (see Note 13 2 Acquisitions and Divestment Accounting for Investments Investments in businesses that the Company does not control, but in which the Company has the ability to exercise significant influence over operating and financial matters, are accounted for using the equity method. The Company periodically evaluates its equity method investments for impairment due to declines considered to be other than temporary. If the Company determines that a decline in fair value is other than temporary, then a charge to earnings is recorded, and a new basis in the investment is established. Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Significant estimates affecting amounts reported or disclosed in the consolidated financial statements include revenues, accounts receivables, allowances for doubtful accounts receivable, net realizable value of inventories, valuation of intangible assets, depreciation and amortization periods for long-lived assets, valuation allowances recorded against deferred tax assets, the valuation of stock-based compensation, valuation of derivative instruments, valuation of debt instruments and loss contingencies. These estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the current circumstances. Actual results may differ from those estimates. Revenue Recognition Revenue Recognition under ASC 606 Revenues from Sale of Electricity and Natural Gas On January 1, 2018, the Company adopted Accounting Standard Update ("ASU") No. 2014 09 Revenue from Contracts with Customers (Topic 606 606 five The Company adopted ASC 606 606 605 The Company records unbilled revenues for the estimated amount customers will be billed for services rendered from the time meters were last read to the end of the respective accounting period. The unbilled revenue is estimated each month based on available per day usage data, the number of unbilled days in the period adjusted for seasonality based cooling and heating degree-days and historical trends. Utility companies offer purchase of receivable, or POR, programs in most of the service territ The Company’s performance obligations are generally pursuant to contracts for which the estimated customer relationship periods are currently less than one 606 one Revenues from Sale of Solar Panels The revenue sales of solar panels are recognized at a point in time following the transfer of control of the solar panels to the customer, which typically occurs upon shipment or delivery depending on the terms of the underlying contracts. For sales contracts that contain multiple performance obligations, such as the shipment or delivery of solar modules, we allocate the transaction price to each performance obligation identified in the contract based on relative standalone selling prices, or estimates of such prices, and recognize the related revenue as control of each individual product is transferred to the customer, in satisfaction of the corresponding performance obligations. The following table shows the Company’s revenues disaggregated by pricing plans offered to customers: (in thousands) Electricity Natural Gas Other Total For the year ended December 31, 2018 Fixed rate $ 77,383 $ 2,781 $ — $ 80,164 Variable rate 150,500 43,779 — 194,279 Other — — 5,866 5,866 Total $ 227,883 $ 46,560 $ 5,866 $ 280,309 For the year ended December 31, 2017 Fixed rate $ 61,973 $ 1,866 $ — $ 63,839 Variable rate 160,198 38,232 — 198,430 Other — — 1,933 1,933 Total $ 222,171 $ 40,098 $ 1,933 $ 264,202 The following table shows the Company’s revenues disaggregated by non-commercial and commercial channels: (in thousands) Electricity Natural Gas Other Total For the year ended December 31, 2018 Non-Commercial Channel $ 217,019 $ 43,383 $ — $ 260,402 Commercial Channel 10,864 3,177 — 14,041 Other — — 5,866 5,866 Total $ 227,883 $ 46,560 $ 5,866 $ 280,309 For the year ended December 31, 2017 Non-Commercial Channel $ 219,984 $ 37,623 $ — $ 257,607 Commercial Channel 2,187 2,475 — 4,662 Other — — 1,933 1,933 Total $ 222,171 $ 40,098 $ 1,933 $ 264,202 Revenue Recognition Under ASC 605 Until December 31, 2018, revenues from GRE’s sale of electricity and natural gas are recognized under the accrual method based on deliveries of electricity and natural gas to customers. Revenues from electricity and natural gas delivered but not billed are estimated and recorded as accounts receivable. Cash received in advance from customers under billing arrangement is reported as deferred revenue and is included in “Accrued expenses” in the accompanying consolidated balance sheets. GOGAS does not yet generate revenues. Oil and Gas Exploration Costs The Company accounts for its oil and gas activities under the successful efforts method of accounting. Under this method, the costs of drilling exploratory wells and exploratory-type stratigraphic test wells are capitalized, pending determination of whether the well has found proved reserves. Other exploration costs are charged to expense as incurred. Unproved properties are assessed for impairment, and if considered impaired, are charged to expense when such impairment is deemed to have occurred (see Note 5 Cash, Cash Equivalents and Restricted Cash The Company considers all highly liquid investments with an original maturity of three Restricted cash represents cash that is not available for use in the Company's operations. On January 1, 2018, the Company adopted ASU No. 2016 18 December 31, 2018 2017 (in thousands) Cash and cash equivalents $ 41,601 $ 29,913 Restricted cash—short-term included in other current assets 1,653 518 Restricted cash—long-term 943 1,496 Total cash, cash equivalents, and restricted cash $ 44,197 $ 31,927 Restricted cash—short-term includes amounts set aside in accordance with the Amended and Restated Preferred Supplier Agreement with BP Energy Company (“BP”) (see Note 17 Trade Accounts Receivable, Net Trade accounts receivable, net are reported in the balance sheet as gross outstanding amounts adjusted for doubtful accounts. Inventories Inventory consists of natural gas, renewable energy credits and solar panels. Natural Gas Natural gas inventory is stored at various third parties’ underground storage facilities and is stated at lower of cost or net realizable value. Company’s natural gas inventory was valued at weighted average cost, which was based on the purchase price of the natural gas and the cost to transport, plus or minus injections or withdrawals. Renewable Energy Credits GRE must obtain a certain percentage or amount of its power supply from renewable energy sources in order to meet the requirements of renewable portfolio standards in the states in which it operates. This requirement may be met by obtaining renewable energy credits that provide evidence that electricity has been generated by a qualifying renewable facility or resource. GRE holds renewable energy credits for both sale and use, and treats the credits as a government incentive to encourage the construction of renewable power plants. Renewable energy credits are valued at the lower of cost and market, where cost is the purchase price. Gains and losses from the sale of renewable energy credits are recognized in cost of revenues when the credits are transferred to the buyer. Solar Panels Inventories related to solar panels are stated at the lower of cost or net realizable value. The cost is determine using the first-in, first-out basis and includes both the costs of acquisition and the costs of manufacturing. These costs include direct material, direct labor, and indirect manufacturing costs, including depreciation and amortization. The capitalization of costs into inventory is based on the normal utilization of our plant. If the plant utilization is abnormally low, the portion of the indirect manufacturing costs related to the abnormal utilization level are expensed as incurred. The Company regularly reviews the cost of inventories against their estimated net realizable value and records write-downs if any inventories have costs in excess of their net realizable values. The Company also regularly evaluates the quantities and values of inventories, in light of current market conditions and trends among other factors and records write-downs for any quantities in excess of demand or for any obsolescence. This evaluation considers the use of modules in the systems business, expected demand, anticipated sales prices, strategic raw material requirements, new product development schedules, the effect new products might have on the sale of existing products, product obsolescence, product merchantability, and other factors. Market conditions are subject to change, and actual consumption of our inventory could differ from forecasted demand. Inventories consisted of the following: December 31, 2018 2017 (in thousands) Natural gas $ 1,116 $ 975 Renewable credits 8,654 3,011 Solar Panels: Finished goods 40 — Raw materials 83 — Total solar panels inventory 123 — Totals $ 9,893 $ 3,986 Long-lived Assets Property, plant and equipment - net is stated at historical cost less accumulated depreciation and any impairment. The Company provides for depreciation using a straight-line method over estimated useful life of the assets. Any leasehold improvements are amortized over the lesser of the lease term or the useful life. The cost of major additions and improvements are capitalized, while maintenance and repair costs that do not improve or extend the lives of the respective assets are charged to operations as incurred. The estimated useful life of property plant and equipment as as follows: Years Building and improvements 4 27 Machinery and equipment 2 9 Computer software and development 2 5 Computers and computer hardware 2 5 Office equipment and other 5 7 The fair value of patents and trademarks, non-compete agreements and customer relationships acquired in a business combination accounted for under the purchase method are amortized over their estimated useful lives as follows: patents and trademarks are amortized on a straight-line basis over 10 to 20 2 2 9 The Company tests the recoverability of its long-lived assets with finite useful lives whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. The Company tests the recoverability based on the projected undiscounted cash flows to be derived from such asset. If the projected undiscounted future cash flows are less than the carrying value of the asset, the Company will record an impairment loss based on excess of carrying value over fair value of the assets. The Company generally measures fair value by considering sale prices for similar assets or by discounting estimated future cash flows from such asset using an appropriate discount rate. Cash flow projections and fair value estimates require significant estimates and assumptions by management. Should the estimates and assumptions prove to be incorrect, the Company may be required to record impairments in future periods and such impairments could be material. Acquisitions Results of operations of acquired companies are included in the Company’s results of operations as of the respective acquisition dates. The purchase price of each acquisition is allocated to the net assets acquired based on estimates of their fair values at the date of the acquisition. Any purchase price in excess of these net assets is recorded as goodwill. The allocation of purchase price in certain cases may be subject to revision based on the final determination of fair values during the measurement period, which may be up to one Goodwill and Indefinite Lived Intangible Assets Goodwill is the excess of the acquisition cost of businesses over the fair value of the identifiable net assets acquired. Goodwill and other indefinite lived intangible assets are not amortized. These assets are reviewed annually (or more frequently under various conditions) for impairment using a fair value approach. In the fourth quarter of 2018 one 18 The Company has three four The fair value of the reporting unit is estimated using discounted cash flow methodologies, as well as considering third party market value indicators. Calculating the fair value of the reporting units requires significant estimates and assumptions by management. Should the estimates and assumptions regarding the fair value of the reporting units prove to be incorrect, the Company may be required to record impairments to its goodwill in future periods and such impairments could be material. The Company performed its annual goodwill impairment test as of October 1, 2018. In reviewing goodwill for impairment, the Company has the option, for any or all of its reporting units that carry goodwill - to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not (i.e. greater than 50 Derivative Instruments and Hedging Activities The Company records its derivatives instruments at their respective fair values. The accounting for changes in the fair value (that is, gains or losses) of a derivative instrument is dependent upon whether the derivative has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. Due to the volatility of electricity and natural gas prices, GRE enters into futures contracts, swaps and put and call options as hedges against unfavorable fluctuations in market prices of electricity and natural gas and to reduce exposure from price fluctuations. The Company does not designate its derivative instruments to qualify for hedge accounting, accordingly the futures contracts, swaps and put and call options are recorded at fair value as a current asset or liability and any changes in fair value are recorded in “Cost of revenues” in the consolidated statements of operations. In addition to the above, GRE utilizes forward physical delivery contracts for a portion of its purchases of electricity and natural gas, which are defined as commodity derivative contracts. Using the exemption available for qualifying contracts, GRE applies the normal purchase and normal sale accounting treatment to its forward physical delivery contracts, thereby these contracts are not adjusted to fair value. GRE also applies the normal purchase and normal sale accounting treatment to forward contracts for the physical delivery of electricity in nodal energy markets that result in locational marginal pricing charges or credits, since this does not constitute a net settlement, even when legal title to the electricity is conveyed to the ISO during transmission. Accordingly, GRE recognizes revenue from customer sales, and the related cost of revenues, at the contracted price, as electricity and natural gas is delivered to retail customers. Shipping and Handling Fees and Costs Amounts billed to customers for shipping and handling are included in revenues. The related minimal 0.1 0.2 December 31, 2018 2017 Foreign Currency Assets and liabilities of foreign subsidiaries denominated in foreign currencies are translated to U.S. Dollars at end-of-period rates of exchange, and their monthly results of operations are translated to U.S. Dollars at the average rates of exchange for that month. Gains or losses resulting from such foreign currency translations are recorded in “Accumulated other comprehensive income” in the accompanying consolidated balance sheets. Foreign currency transaction gains and losses are reported in “Other (expense) income, net” in the accompanying consolidated statements of operations. Advertising Expense Cost of advertising for customer acquisitions is charged to selling, general and administrative expense in the period in which it is incurred. Most of the advertisements are in print, over the radio, or direct mail. In the years ended December 31, 2018 2017 2.4 2.1 Income Taxes The Company recognizes deferred tax assets and liabilities for the future tax consequences attributable to temporary differences between the financial statements carrying amounts of existing assets and liabilities and their respective tax bases. A valuation allowance is provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized. The ultimate realization of deferred tax assets depends on the generation of future taxable income during the period in which related temporary differences become deductible. The Company considers the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in its assessment of a valuation allowance. Deferred tax assets and liabilities are measured using the enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date of such change. The Company uses a two 50 one The Company classifies interest and penalties on income taxes as a component of income tax expense. Contingencies The Company accrues for loss contingencies when both (a) information available prior to issuance of the financial statements indicates that it is probable that a liability had been incurred at the date of the financial statements and (b) the amount of loss can reasonably be estimated. When the Company accrues for loss contingencies and the reasonable estimate of the loss is within a range, the Company records its best estimate within the range. When no amount within the range is a better estimate than any other amount, the Company accrues the minimum amount in the range. The Company discloses an estimated possible loss or a range of loss when it is at least reasonably possible that a loss may have been incurred. Earnings Per Share Basic earnings per share is computed by dividing net income or loss attributable to all classes of common stockholders of the Company by the weighted average number of shares of all classes of common stock outstanding during the applicable period. Diluted earnings per share is determined in the same manner as basic earnings per share, except that the number of shares is increased to include restricted stock still subject to risk of forfeiture and to assume exercise of potentially dilutive stock options using the treasury stock method, unless the effect of such increase is anti-dilutive. The weighted-average number of shares used in the calculation of basic and diluted earnings per share attributable to the Company’s common stockholders consists of the following: Year ended December 31, 2018 2017 (in thousands) Basic weighted-average number of shares $ 25,154 $ 23,531 Effect of dilutive securities Stock options and warrants 130 — Non-vested restricted Class B common stock 411 — Diluted weighted-average number of shares $ 25,695 $ 23,531 The following shares were excluded from the diluted earnings per share computations because their inclusion would have been anti-dilutive: Year ended December 31, (in thousands) 2018 2017 Stock options 341 383 Non-vested restricted Class B common stock — 762 Shares excluded from the calculation of diluted earnings per share 341 1,145 The diluted loss per share equals basic loss per share in the years ended December 31, 2017 Stock-Based Compensation The Company recognizes compensation expense for grants of stock-based awards to its employees based on the estimated fair value on the grant date. Stock based awards granted to nonemployees are marked-to-market until the vesting of the award. Compensation cost for awards is recognized using the straight-line method over the requisite service period, which approximates the vesting period. Stock-based compensation is included in selling, general and administrative expense. Vulnerability Due to Certain Concentrations Financial instruments that potentially subject the Company to concentration of credit risk consist principally of cash, cash equivalents, restricted cash, certificates of deposit and trade accounts receivable. The Company holds cash, cash equivalents and restricted cash at several major financial institutions, which may exceed FDIC insured limits. Historically, the Company has not experienced any losses due to such concentration of credit risk. The Company’s temporary cash investments policy is to limit the dollar amount of investments with any one GRE’s REPs reduce their customer credit risk by participating in purchase of receivable, or POR, programs for a majority of their receivables. In addition to providing billing and collection services, utility companies purchase those REPs’ receivables and assume all credit risk without recourse to those REPs. GRE’s REPs’ primary credit risk is therefore nonpayment by the utility companies. Certain of the utility companies represent significant portions of the Company’s consolidated revenues and consolidated gross trade accounts receivable balance and such concentrations increase the Company’s risk associated with nonpayment by those utility companies. The following table summarizes the percentage of consolidated revenues from customers by utility company that equal or exceed 10 10 Year ended December 31, 2018 2017 Con Edison 11 % 15 % ComEd na % 10 % na – less than 10 The following table summarizes the percentage of consolidated gross trade accounts receivable by utility company that equal or exceed 10 2017 10 December 31, 2018 2017 December 31 2018 2017 Con Edison na % 11 % na – less than 10 Allowance for Doubtful Accounts The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the accounts receivable balance. The allowance is determined based on known troubled accounts, historical experience and other currently available evidence. Doubtful accounts are written-off upon final determination that the trade accounts will not be collected. The change in the allowance for doubtful accounts was as follows: (in thousands) Balance at beginning of period Additions charged (reversals credited) to expense Additions (deductions) ( 1 Balance at end of period Year ended December 31, 2018 Reserves deducted from accounts receivable: Allowance for doubtful accounts $ 1,099 $ 904 $ — $ 2,003 Year ended December 31, 2017 Reserves deducted from accounts receivable: Allowance for doubtful accounts $ 171 $ 762 $ 166 $ 1,099 ( 1 Primarily uncollectible accounts written off, net of recoveries. Fair Value Measurements Fair value of financial and non-financial assets and liabilities is defined as an exit price, which is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The three Level 1 — quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 — quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. Level 3 — unobservable inputs based on the Company’s assumptions used to measure assets and liabilities at fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of the assets and liabilities being measured and their placement within the fair value hierarchy. Accounting Standards Updates In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASC 606 1 2 3 4 5 606 In January 2016, the FASB issued ASU No. 2016 01 Recognition and Measurement of Financial Assets and Financial Liabilities 1 2 3 4 In February 2016, the FASB issued ASU No. 2016 02 Leases (Topic 842 12 2016 02 2018 10 842 2018 10 2018 11 842 2018 11 2018 10 2016 02 sixteen 2018 11 840 840 840 840 2018 11 two 2016 02 The Company will adopt the new standard on January 1, 2019. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. As a lessee, the most significant impact of the standards relates to the recognition of the ROU assets and lease liabilities for the operating leases in the balance sheet. The Company is in the final process of implementing a new lease accounting policy and updating its controls and procedures for maintaining and accounting for its lease portfolio under the new guidance. Upon adoption of Topic 842 In June 2016, the FASB issued ASU No. 2916 13 Measurement of Credit Losses on Financial Instruments In November 2016, the FASB issued ASU No. 2016 18 Restricted Cash The Company adopted the amendments in this ASU on January 1, 2018. For the year ended December 31, 2 017 0.1 10.0 0.6 2016 18 $ 2.0 11.9 2016 The adoption did not have a material impact on the Company's consolidated balance sheets, results of operations and cash flows, other than the impact discussed above. In January 2017, the FASB issued ASU No. 2017 01 Business Combinations three 1 2 two 2017 01 The Company accounted for the Smile Energy G.K. ("Smile Energy") acquisition as an asset acquisition (see Note 2 Acquisitions and Divestitures The adoption did not have a material impact on the Company's consolidated balance sheets, results of operations and cash flows, other than the impact discussed above. In August 2017, the FASB issued ASU No. 2017 12 Derivatives and Hedging (Topic 815 In June 2018, the FASB issued ASU No. 2018 07 718 718 718 718 1 2 606 In August 2018, the FASB issued ASU No. 2018 13 3 3 In November 2018, the FASB issued ASU No. 2018 13 Targeted Improvements to Related Party Guidance for Variable Interest Entities

Acquisitions and Divestiture

Acquisitions and Divestiture	12 Months Ended
	Dec. 31, 2018
Acquisitions [Abstract]
Acquisitions	Note 2 Acquisition of Prism In August 2018 to October 2018, the Company extended an aggregate of $ 1.3 12 On October 25, 2018, the Company completed a transaction to acquire a 60.0 4.0 (i) the conversion of $ 1.4 1.1 1.5 60 Prism is a solar solutions company that is engaged in US based panel manufacturing, solar installation design and project management. Prism’s solar panels feature high efficiency N-type silicon solar cells designed into bifacial solar modules which result in systems with a reduction in the average cost per kilowatt hour, while their glass-on-glass design increases the durability and lifetime value of Prism’s panels. The Company recorded revenue for Prism of approximately $ 3.3 The impact of the acquisition’s preliminary purchase price allocations on the Company’s consolidated balance sheet and the acquisition date fair value of the total consideration transferred were as follows: (in thousands) Cash $ 931 Trade accounts receivable 11 Inventories 1,142 Other current assets 260 Property plant and equipment ( 19 3,564 Intangible assets: Trademark ( 10 290 Patent ( 10 320 Customer contract ( 3 1,400 Goodwill 1,084 Accounts payable accrued expenses ( 1,723 ) Notes payable — ( 63 ) Other current liabilities ( 1,164 ) Notes payable — net of current portion ( 885 ) Noncontrolling interest ( 2,667 ) Net assets $ 2,500 (in thousands) Supplemental information Cash contributed to Prism $ 899 Notes receivable from Prism, including accrued interest, converted to Prism's equity 1,351 Cash payment to previous equity holders of Prism 250 2,500 Notes payable issued to Prism 1,500 Total considerations $ 4,000 As of December 31, 2018, certain amounts relating to the valuation of intangible assets have not been finalized. The finalization of these matters may result in changes to goodwill. Goodwill was allocated to the GES segment. Goodwill is the excess of the consideration transferred over the net assets recognized and represents the expected revenue and cost synergies of the combined company and assembled workforce. Goodwill recognized as a result of the acquisition is not deductible for income tax purposes. Prism's noncurrent notes payable consisted of the following: October 25, 2018 December 31, 2018 (in thousands) 5.95 7,184 $ 918 $ 893 20.00 30 30 948 923 Less: Current maturities 63 923 Noncurrent portion $ 885 $ — Acquisition of Smile Energy G.K. On June 7, 2018, Company subsidiary Genie Japan, LLC (“Genie Japan”), acquired Smile Energy G.K., (“Smile Energy”) from Capital Sixty Sixty 0.7 Sixty 5 1 18 0.3 Sixty The Company accounted for the Smile Energy acquisition as an asset acquisition. The aggregate purchase price was recorded as license to operate as a REP in Japan. The carrying value of the license is included in “Other intangibles, net” in the accompanying consolidated balance sheet. The carrying value of the license will be amortized on a straight-line basis over its estimated 10 Acquisition of Lumo Energia, Ojy On December 17, 2018, the Company through its subsidiary Genie Nordic, LLC entered into a binding Stock Purchase Agreement with Melanko Melanko Gustafsson Gustaffson Otto Sasvasti Sasvasti 80.0 equit Lumo Energia Ojy. (“Lumo) Lumo Lumo On January 2, 2019 (“Closing Date”), the Company completed the purchase of an 80 1.3 1.5 0.2 0.2 The Company contributed € 1.5 1.7 provided with a secured loan for € 2.0 2.3 4 4.0 176,104 three The remaining 20.0 7.5 12.5 three The Company has a continuing call option to purchase a portion or the entire noncontrolling interest from the Sellers during the period beginning at the third anniversary of the Closing Date and ending three The Sellers, as a group, have a one two The acquisition of Lumo will be accounted for using the acquisition method of business combination under ASC 805 Business Combinations 805 Divestiture of Majority Interest in Atid Drilling Ltd. Following the Company’s decision to suspend its oil and gas exploration drilling activities, in June 2018, the Company initiated a plan to sell primarily all of Atid’s assets and liabilities. In the year ended December 31, 2018, the Company recorded a write-down to fair value of Atid’s assets held for sale in the amounts of $ 2.7 newly formed contracted drilling services company in Israel, 1.0 37.5 ( 37.5 ( 25.0 newly formed contracted drilling services company in Israel Genie Israel also entered into a Shareholder Agreement with the newly formed contracted drilling services company in Israel 0.4 As of December 31, 2018, there was no outstanding balance on the Credit Facility and the Company has a minimal newly formed contracted drilling services company in Israel The divestiture of a majority interest in Atid does not represent a strategic shift that is expected to have a major effect on the Company’s operations or financial statements. Genie Israel accounts for its investments in the newly formed contracted drilling services company in Israel newly formed contracted drilling services company in Israel 0.5 Acquisition of Mirabito Natural Gas On August 10, 2017, GRE acquired Mirabito Natural Gas, a Ft. Lauderdale, Florida-based natural gas supplier, from Angus Partners, LLC (“Angus”) for an aggregate cash payment of $ 4.0 Also on August 10, 2017, GRE and Angus entered into a Management Agreement pursuant to which Angus will provide any and all functions required to run and operate Mirabito. The Management Agreement terminates in August 2021 30 250,000 The impact of the acquisition’s purchase price allocations on the Company’s consolidated balance sheet and the acquisition date fair value of the total consideration transferred were as follows: (in thousands) Trade accounts receivable $ 509 Prepaid expenses 60 Non-compete agreement 5 Customer relationships ( 9 1,100 Patents and trademarks 760 Goodwill 1,270 Other assets 465 Trade accounts payable ( 299 ) Accrued expenses ( 2 ) Net assets excluding cash acquired $ 3,868 Supplemental information: Cash paid $ 3,955 Cash acquired ( 87 ) Total consideration, net of cash acquired $ 3,868 The goodwill resulting from the acquisition is primarily attributable to the existing workforce of the acquired entities and synergies expected from the combination of GRE and Mirabito’s REP businesses. This goodwill is deductible for income tax purposes. Pro Forma Results (unaudited) The following unaudited pro forma financial information summarizes the results of operations for the years ended December 31, 2018 and 2017 2017 Year ended December 31, (in thousands) 2018 2017 Total revenues $ 281,847 $ 269,800 Net income (loss) 21,524 ( 9,239 ) Net income (loss) attributable to Genie Energy Ltd. common stockholders 22,511 ( 8,976 ) Earnings (loss) per share attributable to Genie energy Ltd. common stockholders Basic 0.89 0.38 Diluted 0.88 0.38

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Measurements [Abstract]
Fair Value Measurements	Note 3 The following table presents the balance of assets and liabilities measured at fair value on a recurring basis: (in thousands) Level 1 ( 1 Level 2 ( 2 Level 3 ( 3 Total December 31, 2018 Assets: Derivative contracts $ 1,107 $ 467 $ — $ 1,574 Liabilities: Derivative contracts $ 2,100 $ 248 $ — $ 2,348 December 31, 2017 Assets: Derivative contracts $ 3,091 $ 1,267 $ — $ 4,358 Liabilities: Derivative contracts $ 693 $ 535 $ — $ 1,228 ( 1 quoted prices in active markets for identical assets or liabilities ( 2 observable inputs other than quoted prices in active markets for identical assets and liabilities ( 3 no observable pricing inputs in the market The Company’s derivative contracts consist of natural gas and electricity put and call options and swaps. The underlying asset in the Company’s put and call options is a forward contract. The Company’s swaps are agreements whereby a floating (or market or spot) price is exchanged for a fixed price over a specified period. Fair Value of Other Financial Instruments The estimated fair value of the Company’s other financial instruments was determined using available market information or other appropriate valuation methodologies. However, considerable judgment is required in interpreting this data to develop estimates of fair value. Consequently, the estimates are not necessarily indicative of the amounts that could be realized or would be paid in a current market exchange. Restricted cash — short-term and long-term, trade accounts receivables, due to IDT Corporation and other current liabilities. At December 31, 2018 2017 1 due to IDT Corporation and other current liabilities were classified as Level 2 Other assets, revolving line of credit, notes payable and other liabilities. At December 31, 2018 and 2017 0.5 0.6 and other liabilities approximated fair value. The fair values were estimated based on the Company’s assumptions, and were classified as Level 3 The following table presents the balance of assets and liabilities measured at fair value on a non-recurring basis: (in thousands) Level 1 ( 1 Level 2 ( 2 Level 3 ( 3 Total December 31, 2018 Impairment of assets $ — $ — $ 2,742 $ 2,742 December 31, 2017 Write-off of capitalized exploration costs $ — $ — $ 6,483 $ 6,483 The Company did not have any transfers of assets or liabilities between Level 1 , Level 2 3 2017 .

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2018
Derivative Instruments [Abstract]
Derivative Instruments	Note 4 The primary risk managed by the Company using derivative instruments is commodity price risk, which is accounted for in accordance with Accounting Standards Codification 815 December 31, 2018 2017 The summarized volume of GRE’s outstanding contracts and options at December 31, 2018 Commodity Settlement Dates Electricity (In MWH) Natural Gas (In Dth) First quarter 2019 244,032 2,370,000 Second quarter 2019 10,240 338,450 Third quarter 2019 31,360 73,900 Fouth quarter 2019 22,090 1,146,000 First quarter 2020 186,560 1,081,832 Second quarter 2020 5,120 55,800 Third quarter 2020 22,800 26,100 Fouth quarter 2020 5,120 27,650 First quarter 2021 — 27,250 Second quarter 2021 — 21,350 Third quarter 2021 — 15,200 Fourth quarter 2021 — 8,100 The fair value of outstanding derivative instruments recorded in the accompanying consolidated balance sheets were as follows: December 31 (in thousands) 2018 2017 Asset Derivatives Balance Sheet Location Derivatives not designated or not qualifying as hedging instruments: Energy contracts and options (1) Other current assets $ 1,116 $ 4,358 Energy contracts and options Other assets 458 — Total derivatives not designated or not qualifying as a hedging instruments — $ 1,574 $ 4,358 Liability Derivatives Derivatives not designated or not qualifying as hedging instruments: Energy contracts and options (1) Other current liabilities $ 2,028 $ 1,228 Energy Contracts and options Other liabilities 320 — Total derivatives not designated or not qualifying as a hedging instruments — $ 2,348 $ 1,228 (1) The Company classifies derivative assets and liabilities as current based on the cash flows expected to be incurred within the following 12 months . The effects of derivative instruments on the consolidated statements of operations were as follows: Amount of Gain (Loss) Recognized on Derivatives Year ended December 31, (in thousands) 2018 2017 Derivatives not designated or not qualifying as hedging instruments Location of Loss Recognized on Derivatives Energy contracts and options Cost of revenues $ ( 2,013 ) $ ( 1,291 )

Afek Oil and Gas Exploration Ac

Afek Oil and Gas Exploration Activities	12 Months Ended
	Dec. 31, 2018
Afek Oil and Gas Exploration Activities [Abstract]
Afek Oil and Gas Exploration Activities	Note 5 In 2013 ten 2016 five 41.0 million of capitalized exploration costs incurred in the Southern region. In 2017 6.5 million of capitalized exploration costs incurred in the Northern region. Subsequent analysis indicates that a zone within the well contains evidence of hydrocarbons at levels sufficient to warrant additional testing. Accordingly, Afek requested and received a renewal of its exploratory license from the Ministry of Energy for the Northern portion of its former license area. Afek is in the process of securing the permits and other regulatory approvals needed to perform the testing.

Investment in Equity Method Inv

Investment in Equity Method Investees	12 Months Ended
	Dec. 31, 2018
Investment in Equity Method Investees
Investment in Equity Method Investees	Note 6 stm ent Investment in Shoreditch Energy Limited On July 17, 2017, the Company’s subsidiary, Genie Energy UK Ltd. (“GEUK”), entered into a definitive agreement with Energy Global Investments Pty Ltd (“EGC”) to launch Shoreditch Energy Limited (“Shoreditch”), a joint venture to offer electricity and natural gas service to residential and small business customers in the United Kingdom, using the trade name Orbit Energy (the"JV Agreement"). In August 2018, 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 revised budgets and forecasts. In September and December 2018, the Company contributed an total of $ 1.3 5.3 In connection with the revised contributions and obligations, the 65 67 E GC’s 35 33 GEUK appoints three two In September and December 2018, the Company extended a total of $ 0.2 2 0.2 The following table summarizes the change in the balance of GEUK’s investment in Shoreditch (in thousands): For the year ended December 31, 2018 2017 Balance, beginning of period $ 3,450 $ — Capital contributions 1,306 3,970 Cumulative foreign currency translation adjustment ( 87 ) 45 Equity in the net loss ( 2,990 ) ( 565 ) Balance, end of period $ 1,679 $ 3,450 At December 31, 2018, the Company’s maximum exposure to loss as a result of its involvement with Shoreditch was its $ 1.7 Inv estment in New Atid As discussed in Note 2 , Acquisitions and Divestitures, i n September 2018, the Company divested a majority interest in Atid and retained 37.5 The following table summarizes the change in the balance of investment in for the period from September 1, 2018 to December 31, 2018 (in thousands): Balance, beginning of period $ — Capital contributions 1,000 Equity in net loss ( 440 ) Cumulative foreign currency translation adjustments ( 31 ) Balance, end of period $ 529

Property and Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2018
Property and Equipment [Abstract]
Property and Equipment	Note 7 December 31 (in thousands) 2018 2017 Land $ 230 $ — Building and improvements 2,291 29 Manufacturing equipment 1,403 3,833 Computer software 2,229 1,912 Computers and computer hardware 237 246 Office equipment and other 270 414 6,660 6,434 Less: accumulated depreciation ( 2,359 ) ( 2,414 ) Property and equipment, net $ 4,301 $ 4,020 Depreciation expense of property and equipment 0.8 0.8 December 31, 2018 2017

Goodwill and Other Intangibles

Goodwill and Other Intangibles	12 Months Ended
	Dec. 31, 2018
Goodwill and Other Intangibles [Abstract]
Goodwill and Other Intangibles	Note 8 The table below reconciles the change in the carrying amount of goodwill for the period from January 1, 2017 to December 31, 2018 (in thousands) GRE GES Total Balance at January 1, 2017 $ 8,728 $ — $ 8,728 Acquisition of Mirabito (see Note 2 1,270 — 1,270 Balance at December 31, 2017 9,998 — 9,998 Acquisition of Prism (see Note 2 — 1,084 1,084 Balance at December 31, 2018 $ 9,998 $ 1,084 $ 11,082 The table below presents information on the Company’s other intangible assets: (in thousands) Weighted Average Amortization Period Gross Carrying Amount Accumulated Amortization Net Balance December 31, 2018 Patents and trademarks 17.3 $ 3,470 $ ( 288 ) $ 3,182 Non-compete agreement 2.0 115 ( 112 ) 3 Customer relationships 4.0 4,612 ( 2,334 ) 2,278 Licenses 10.0 895 ( 37 ) 858 TOTAL $ 9,092 $ ( 2,771 ) $ 6,321 December 31, 2017 Trademark 20.0 $ 2,860 $ ( 135 ) $ 2,725 Non-compete agreement 2.0 115 ( 65 ) 50 Customer relationships 4.4 3,200 ( 1,266 ) 1,934 Licenses — 150 — 150 TOTAL $ 6,325 $ ( 1,466 ) $ 4,859 Amortization expense of intangible assets (including minimal amount reported in cost of revenues) was $ 1.3 1.3 December 31, 2018 2017 0.9 0.9 0.9 0.4 0.4 2.8 2020 2021 2022, 2023 and 2024 and thereafter,

Revolving Line of Credit

Revolving Line of Credit	12 Months Ended
	Dec. 31, 2018
Revolving Lines of Credit [Abstract]
Revolving Lines of Credit	Note 9 On April 4, 2017, GRE, IDT Energy, and other GRE subsidiaries entered into a Credit Agreement with Vantage Commodities Financial Services II, LLC (“Vantage”) for a $ 20 outstanding principal amount incurs interest at LIBOR 4.5 April 3, 2020 December 31, 2018 2017 2.5 7.24 5.99 The Company and IDT Energy had a Loan Agreement with JPMorgan Chase Bank for a revolving line of credit for up to a maximum principal amount of $ 25.0 lesser of (a) the LIBOR 1.0 Interest was payable at least every three May 31, 2017 equal to the greater of (a) $ 10.0 10.0 t of $ 8.1 million were outstanding. On May 31, 2017, the $ 10.0 million cash collateral was released upon expiration of the Loan Agreement.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Taxes [Abstract]
Income Taxes	Note 10 On December 22, 2017, the U.S. government enacted “An Act to Provide for Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018 35.0 21.0 one On December 22, 2017, the SEC issued Staff Accounting Bulletin No. 118 118 740 118 118 12 The Company has completed its accounting for the income tax effects of the enactment of the Tax Act and made no changes to the provisional amounts previously recorded. The table below in this footnote reflects the new income tax rate. The transition tax is based on total post- 1986 The Company anticipates that its assumptions and estimates could change as a result of future guidance and interpretation from the Internal Revenue Service, the SEC, the FASB, and various other taxing jurisdictions. In particular, the Company anticipates that the U.S. state jurisdictions will continue to determine and announce their conformity with or decoupling from the Tax Act. The Company will continue to evaluate the impact of the Tax Act on its financial statements and will record the effect of any reasonable changes in its estimates and adjustments. The components of income (loss) before income taxes are as follows: Year ended December 31, (in thousands) 2018 2017 Domestic $ 15,246 $ 7,122 Foreign ( 6,222 ) ( 14,044 ) INCOME (LOSS) BEFORE INCOME TAXES $ 9,024 $ ( 6,922 ) Significant components of the Company’s deferred income tax assets consist of the following: December 31 (in thousands) 2018 2017 Deferred income tax assets: Bad debt reserve $ 543 $ 302 Accrued expenses 2,629 4,425 State taxes 91 117 Charitable contributions 189 265 Net operating loss 46,632 37,435 Stock options and restricted stock 519 908 Depreciation 6,209 7,026 Total deferred income tax assets 56,812 50,478 Valuation allowance ( 41,187 ) ( 48,337 ) DEFERRED INCOME TAX ASSETS, NET $ 15,625 $ 2,141 The Company recognizes deferred tax assets to the extent that it believes that these assets are more likely than not to be realized. In making such a determination, the Company considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If the Company determines that it would be able to realize its deferred tax assets in the future in excess of their net recorded amount, the Company would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes. The Company released the valuation allowance of $15.0 million in 2018 to reflect the anticipated utilization of the U.S. deferred tax assets. The (provision for) benefit from income taxes consists of the following: Year ended December 31, (in thousands) 2018 2017 Current: Federal $ — $ — State and local ( 1,107 ) ( 1,366 ) Foreign — — ( 1,107 ) ( 1,366 ) Deferred: Federal 13,609 — State and local ( 126 ) ( 360 ) Foreign — — ( 13,483 ) ( 360 ) BENEFIT FROM (PROVISION FOR) INCOME TAXES $ 12,376 $ ( 1,726 ) The differences between benefit from (provision for) income taxes expected at the U.S. federal statutory income tax rate and income taxes provided are as follows: Year ended December 31, (in thousands) 2018 2017 U.S. federal income tax benefit at statutory rate $ ( 1,895 ) $ 2,423 Valuation allowance 15,113 11,694 Nondeductible expense ( 12 ) — Foreign tax rate differential 1,493 ( 2,610 ) Tax law change — ( 11,070 ) Deferred income tax adjustment ( 1,093 ) ( 1,250 ) Other ( 81 ) 66 State and local income tax, net of federal benefit ( 1,149 ) ( 979 ) BENEFIT FROM (PROVISION FOR) INCOME TAXES $ 12,376 $ ( 1,726 ) At December 31, 2018 25.9 125.3 2034 2030 December 31, 2018 2038 At December 31, 2018 104.6 103.6 The Company includes certain entities that are not included in the Company’s consolidated tax return. The entities have separate U.S. federal and state net operating loss carry-forwards of $ 29.7 2025 25.7 382 The change in the valuation allowance for deferred income taxes was as follows: (in thousands) Balance at beginning of period Additions charged to costs and expenses Deductions Balance at end of period Year ended December 31, 2018 Reserves for valuation allowances deducted from deferred income taxes, net $ 48,337 $ 7,963 $ ( 15,113 ) $ 41,187 Year ended December 31, 2017 Reserves for valuation allowances deducted from deferred income taxes, net $ 52,978 $ 7,053 $ ( 11,694 ) $ 48,337 The table below summarizes the change in the balance of unrecognized income tax benefits: Year ended December 31, (in thousands) 2018 2017 Balance at beginning of period $ 558 $ 632 Additions based on tax positions related to the current period 98 100 Additions for tax positions of prior periods — 1 Lapses of statutes of limitations ( 223 ) ( 175 ) Balance at end of period $ 433 $ 558 All of the unrecognized income tax benefits at December 31, 2018 2017 twelve In the years ended December 31, 2018 2017 minimal December 31, 2018 2017 minimal The Company currently remains subject to examinations of its tax returns as follows: U.S. federal tax returns for 2015 2018 2014 2018 2014 2018

Equity

Equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Equity	Note 11 — Equity Class A Common Stock and Class B Common Stock The rights of holders of Class A common stock and Class B common stock are identical except for certain voting and conversion rights and restrictions on transferability. The holders of Class A common stock and Class B common stock receive identical dividends per share when and if declared by the Company’s Board of Directors. In addition, the holders of Class A common stock and Class B common stock have identical and equal priority rights per share in liquidation. The Class A common stock and Class B common stock do not have any other contractual participation rights. The holders of Class A common stock are entitled to three one 2012 one Series 2012 Each share of Preferred Stock has a liquidation preference of $ 8.50 0.6375 seven and one 7.5 32 8,750,000 The Preferred Stock is redeemable, in whole or in part, at the option of the Company following October 11, 2017 at 101 100 The Base Dividend is payable (if declared by the Company’s Board of Directors, and accrued, if not declared) quarterly on each February 15, May 15, August 15 and November 15, and to the extent that there is any Additional Dividend payable with respect to a fiscal year, it will be paid to holders of Preferred Stock with the May dividend. With respect to the payment of dividends and amounts upon liquidation, dissolution or winding up, the Preferred Stock is equal in rank to all other equity securities the Company issues, the terms of which specifically provide that such equity securities rank on a parity with the Preferred Stock with respect to dividend rights or rights upon the Company’s liquidation, dissolution or winding up; senior to the Company’s common stock; and junior to all of the Company’s existing and future indebtedness. Each share of Preferred Stock has the same voting rights as a share of Class B common stock, except on certain matters that only impact the Company’s common stock, as well as additional voting rights on specific matters or upon the occurrence of certain events. Dividend Payments In the year ended December 31, 2018 0.30 7.7 December 31, 2017 0.30 7.4 0.075 2017 March 25, 2019 March 29, 2019 I n each of the years ended December 31, 2018 2017 0.6376 1.5 0.1594 2018 February 6, 2019 The State of Delaware, allow companies to declare dividends out of its “Surplus,” which is calculated by deducting the par value of the company’s stock from the difference between total assets less total liabilities. The Company elected to record dividends declared against accumulated deficit. Stock Repurchases On March 11, 2013, the Board of Directors of the Company approved a stock repurchase program for the repurchase of up to an aggregate of 7.0 December 31, 2018 2017 December 31, 2017 6.9 In the year ended December 31, 2018 0.9 149,000 December 31, 2017 0.8 129,898 Repurchase Right on Sale of Shares to Howard S. Jonas On July 30, 2014, the Company entered into a Second Amended and Restated Employment Agreement and a Restricted Stock Sale Agreement with Howard S. Jonas, the Company’s Chairman of the Board and former Chief Executive Officer. Pursuant to these agreements, among other things, in 2014 3.6 6.82 0.6 6.82 December 31, 2018 Sales of Shares and Warrants On June 8, 2018, the Company sold to Howard S. Jonas, the Chairman of the Company’s Board of Directors and a principal owner, ( 1 1,152,074 4.34 5.0 2 1,048,218 4.77 5.0 June 2023 the Company sold to a third-party investor ( 1 230,415 4.34 1.0 2 209,644 4.77 1.0 1,257,862 4.77 June 2023 Purchases of Equity of Subsidiary In June 2018, an entity affiliated with Lord (Jacob) Rothschild exercised its option to exchange its 5 41,667 0.22 92 97 In the year ended December 31, 2017 1.15 0.3

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2018
Stock-Based Compensation [Abstract]
Stock-Based Compensation	Note 12 Stock-Based Compensation Plan The Company’s 2011 2011 On May 7, 2018, the Company’s stockholders approved an amendment to the Company’s 2011 974,199 December 31, 2018 2.3 2011 275,000 Restricted Stock The fair value of restricted shares of the Company’s Class B common stock is determined based on the closing price of the Company’s Class B common stock on the grant date. Share awards generally vest on a graded basis over three A summary of the status of the Company’s grants of restricted shares of Class B common stock is presented below: Number of Non-vested Shares (in thousands) Weighted- Average Grant Date Fair Value Non-vested shares at December 31, 2017 163 $ 6.19 Granted 285 5.30 Vested ( 78 ) 5.44 Forfeited ( 3 ) 5.37 NON-VESTED SHARES AT DECEMBER 31, 2018 367 $ 5.46 At December 31, 2018 1.7 2.3 December 31, 2018 2017 0.4 0.4 3.4 3.1 December 31, 2018 2017 Stock Options Option awards are generally granted with an exercise price equal to the market price of the Company’s stock on the date of grant. Option awards generally vest on a graded basis over three ten On May 7, 2018, the Company’s stockholders approved a grant of options to Howard S. Jonas to purchase 256,818 4.34 0.3 five The fair value of stock options granted in the years ended December 31, 2018 was estimated on the date of the grant using a Black-Scholes valuation model and the assumptions in the following table (dollar amount in thousands). No option awards were granted in the year ended December 31, 2017 . Average risk-free interest rate 2.6 % Expected dividend yield 6.9 % Expected volatility 55.8 % Expected term 5 yea Weighted-average grant date fair value of options granted $ 1.27 A summary of stock option activity for the Company is as follows: Number of Options (in thousands) Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2017 383 $ 6.85 3.8 $ — Granted 257 4.34 Exercised — — Cancelled/Forfeited ( 43 ) 6.85 OUTSTANDING AT DECEMBER 31, 2018 597 $ 5.77 3.5 $ 434 EXERCISABLE AT DECEMBER 31, 2018 312 $ 6.85 2.8 $ — The total intrinsic value of options exercised during the years ended 2017 December 31, 2018 minimal 0.8 minimal December 31, 2018 2017 Subsidiary Equity Grants Reclassified to Liability On May 5, 2015, the Compensation Committee of the Company’s Board of Directors approved the grant of deferred stock units in GRE representing an aggregate of 3.9 3.3 In August 2017, GRE elected to exchange shares of the Company’s Class B common stock for the vested deferred stock units based on the relative fair value of the shares exchanged. The Company issued 287,233 26.1 1.8 The Company acquired 129,898 0.8 In August 2018, the Company issued 310,467 1.9 128,865 0.8 The Company recognized aggregate compensation cost related to the vesting of the deferred stock units and other subsidiary equity interests that were granted in prior years of $ 1.1 2.1 December 31, 2018 2017 GRES and GREI Equity Grants In August 2017, Genie Retail Energy International, LLC ("GREI"), a subsidiary of GRE, which holds the Company's interests in ventures in the U. K., Japan and Finland, granted deferred stock units in GREI representing an aggregate of 4.0 $ 0.1 nil 2017 0.1 1.6 In August 2017, Genie Retail Energy Services, LLC ("GRES"), a subsidiary of GRE, granted deferred stock units in GES representing an aggregate of 4.5 % of the outstanding equity in GRES to certain of the Company’s officers and a consultant. The deferred stock units vest in equal amounts on the first, second and third anniversaries of the date of grant. The fair value of the GRES deferred stock units on the date of grant was minimal, which is being recognized on a straight-line basis over the requisite service period, which approximates the vesting period. GRES recognized compensation costs related to the vesting of the GRES deferred stock units of minimal amount nil 2017 0.1 1.6

Variable Interest Entity

Variable Interest Entity	12 Months Ended
	Dec. 31, 2018
Variable Interest Entity [Abstract]
Variable Interest Entity	Note 13 Citizens Choice Energy, LLC (“CCE”) is a REP that resells electricity and natural gas to residential and small business customers in the State of New York. The Company does not own any interest in CCE. Since 2011 In October 2015, GRE paid $ 0.2 0.5 100 one 0.5 October 22, 2023 Net income (loss) related to CCE and aggregate net funding repaid to (provided by) the Company were as follows: Year ended December 31, (in thousands) 2018 2017 Net (loss) income $ ( 1,197 ) $ 112 Aggregate funding (provided by) ( 809 ) 158 Summarized consolidated balance sheet amounts related to CCE are as follows: December 31 (in thousands) 2018 2017 ASSETS Cash and cash equivalents $ 70 $ 83 Trade accounts receivable 623 1,031 Prepaid expenses 377 451 Other current assets 34 31 Other assets 359 439 TOTAL ASSETS $ 1,463 $ 2,035 LIABILITIES AND NONCONTROLLING INTERESTS Current liabilities $ 513 $ 698 Due to IDT Energy 1,949 1,140 Noncontrolling interests from CCE ( 999 ) 197 TOTAL LIABILITIES AND NONCONTROLLING INTERESTS $ 1,463 $ 2,035 The assets of CCE may only be used to settle obligations of CCE, and may not be used for other consolidated entities. The liabilities of CCE are non-recourse to the general credit of the Company’s other consolidated entities.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income	Note 14 The accumulated balances for other comprehensive income were as follows: (in thousands) Foreign currency translation Balance at December 31, 2016 $ 1,465 Other comprehensive income attributable to Genie 1,580 Balance at December 31, 2017 3,045 Other comprehensive loss attributable to Genie ( 454 ) Balance at December 31, 2018 $ 2,591

Legal and Regulatory Proceeding

Legal and Regulatory Proceedings	12 Months Ended
	Dec. 31, 2018
Legal and Regulatory Proceedings [Abstract]
Legal and Regulatory Proceedings	Note 15 Legal Proceedings On October 5, 2018, named plaintiffs Scott Mackey and Daniel Hernandez filed a putative class action complaint against IDT Energy in the United States District Court for the Northern District of Illinois alleging violations of the Telephone Consumer Protection Act, 47 227 1 one four 2 one 12 four On March 13, 2014, July 2, 2014 and July 15, 2014, named plaintiffs in Pennsylvania, New York and New Jersey commenced three three Under the Settlement Agreement, the Company has agreed to pay certain amounts to resolve the lawsuits and obtain a release of claims that were, or could have been, asserted in the lawsuits or that are related to, or arise out of the conduct alleged in the lawsuits or similar conduct, wherever it may have occurred. The settlement payment includes payments to customers who timely made a claim, class counsel, and the named plaintiffs, as well as the cost of a claims administrator for administrating the claims process. In 2017 9.0 2017 2018 7.6 For the year ended December 31, 2018, the Company reduced the liability for the settlement payment by $ 3.4 1.7 2017 1.7 2.3 In addition to the matters disclosed above, the Company may from time to time be subject to legal proceedings that arise in the ordinary course of business. Although there can be no assurance in this regard, the Company does not expect any of those legal proceedings to have a material adverse effect on the Company’s results of operations, cash flows or financial condition. Agency and Regulatory Proceedings From time to time, the Company receives inquiries or requests for information or materials from public utility commissions or other governmental regulatory or law enforcement agencies related to investigations under statutory or regulatory schemes, and the Company responds to those inquiries or requests. The Company cannot predict whether any of those matters will lead to claims or enforcement actions or whether the Company and the regulatory parties will enter into settlements before a formal claim is made. New Jersey Attorney General and New Jersey Board of Public Utilities On May 22, 2018, IDT Energy entered into a Consent Order with the New Jersey Attorney General and the New Jersey Board of Public Utilities to resolve an investigation related to IDT Energy’s pricing and business practices during the winter of 2014 1.4 1.2 2014 2017 1.5 New York Public Service Commission Orders In December 2017, the New York Public Service Commission (“PSC”) held an evidentiary hearing to assess the retail energy market in New York. The parties recently completed post-hearing briefing in the proceedings. The Company is evaluating the potential impact of any new order from the PSC that may follow from the evidentiary process, while preparing various contingencies for operation in compliance with any new requirements that may be imposed. Depending on the final language of any new order, as well as the Company’s ability to modify its relationships with its New York customers, an order could have a substantial impact upon the operations of GRE’s REPs in New York. As of December 31, 2018, New York represented 32.4 24.8 2017 74.2 91.0 An RCE represents a natural gas customer with annual consumption of 100 10 On December 16, 2016, the PSC issued an order (the “ 2016 2016 2016 2016 18,700 10,600 2018 On March 27, 2018, the New York Court of Appeals granted Motions for Leave to Appeal the question of whether the New York Legislature ever imparted to the PSC the authority to regulate the rates that private, non-monopoly REPs charge their customers. The Court of Appeals is now set to review a 2017 Ohio Public Utilities Commission In August and November of 2017 0.2 one 0.2 2018 0.3 0.4 2017 1.4 2.1 State of Connecticut Public Utilities Regulatory Authority On September 19, 2018, the State of Connecticut Public Utilities Regulatory Authority (“PURA”) commenced an investigation into Town Square following customer complaints of allegedly misleading and deceptive sales practices on the part of Town Square. The Office of Consumer Counsel has joined in the investigation. Although Town Square denies any basis for those complaints and any wrongdoing on its part, it is cooperating with the investigation and responding to subpoenas for discovery. As of December 31, 2018, Town Square’s Connecticut customer base represented 8.2 9.5 2017 24.8 20.8 State of Illinois Office of the Attorney General In response to complaints that IDT Energy enrolled consumers without their express consent and misrepresented the amount of savings those consumers would receive, the Office of the Attorney General of the State of Illinois (“IL AG”) has been investigating the marketing practices of IDT Energy and has alleged violations of the Consumer Fraud and Deceptive Business Practices Act, 815 505 1 et seq 815 413 1 et seg. 3.0 Following discussions, IDT Energy signed a proposed consent decree which it rescinded shortly thereafter when the IL AG unilaterally issued a press release which IDT Energy believes violated the spirit and substance of the consent order and discussions. on November 19, 2018, the IL AG filed a Complaint for Injunctive and Other Relief (“Complaint”) against IDT Energy in the Chancery Division of the Circuit Court of Cook County. On March 13, 2018, the IL AG filed a motion to enforce the settlement rescinded by IDT Energy. A court conference is currently scheduled for March 19, 2019. In third quarter of 2018 3.0 5.7 4.5 2017 16.5 25.9

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies [Abstract]
Commitments and Contingencies	Note 16 Purchase Commitments The Company had purchase commitments of $ 107.8 December 31, 2018 90.1 December 31, 2018 (in thousands) Year ending December 31: 2019 $ 68,088 2020 35,655 2021 3,551 2022 547 Total payments $ 107,841 Renewable Energy Credits GRE must obtain a certain percentage or amount of its power supply from renewable energy sources in order to meet the requirements of renewable portfolio standards in the states in which it operates. This requirement may be met by obtaining renewable energy credits that provide evidence that electricity has been generated by a qualifying renewable facility or resource. At December 31, 2018 17.7 Performance Bonds GRE has performance bonds issued through a third party for certain utility companies and for the benefit of various states in order to comply with the states’ financial requirements for REPs. At December 31, 2018 12.5 Lease Commitments The future minimum payments for operating leases at December 31, 2018 (in thousands) Year ending December 31: 2019 $ 527 2020 428 2021 377 2022 217 2023 221 Thereafter 1,530 Total payments $ 3,300 Rental expense under operating leases was $ 0.7 0.8 December 31, 2018 2017 A portion of the Prism facility is being rented out to other tenants. The rent income generated from the lease contracts are not significant to the consolidated financial statements. BP Energy Company Preferred Supplier Agreement As of November 19, 2015, certain of GRE's REPs entered into an Amended and Restated Preferred Supplier Agreement with BP Energy Company (“BP”), which was amended as of June 7, 2018. The agreement’s termination date is November 30, 2021 2.0 December 31, 2018 December 31, 2018 1.6 37.8 14.4 December 31, 2018

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Note 17 — Related Party Transactions On June 8, 2018, the Company sold shares of its Class B common stock and warrants to purchase shares of its Class B common stock to Howard S. Jonas (see Note 11 The Company was formerly a subsidiary of IDT Corporation (“IDT”). On October 28, 2011, the Company was spun-off by IDT. The Company entered into various agreements with IDT prior to the spin-off including an agreement for certain services to be performed by the Company and IDT. Also, the Company provides specified administrative services to certain of IDT’s foreign subsidiaries. The Company leases office space and parking in Rafael’s building and parking from Rafael Holdings, Inc. (“Rafael”) Howard Jonas is Chairman of the Board of Directors and Chief Executive Officer of Rafael. The charges for services provided by IDT to the Company, and rent charged by Rafael, net of the charges for the services provided by the Company to IDT, are included in “Selling, general and administrative” expense in the consolidated statements of operations. Year ended December 31, (in thousands) 2018 2017 Amount IDT charged the Company $ 1,340 $ 1,773 Amount the Company charged IDT $ 355 $ 471 Amount Rafael charged the Company $ 161 $ — The following table presents the balance of receivables and payables to IDT and Rafael: December 31, (in thousands) 2018 2017 Due to IDT $ 267 $ 1,773 Due from IDT $ 33 $ 471 Due to Rafael $ — $ — The Company had notes receivable outstanding from employees aggregating $ 0.2 0.6 December 31, 2018 2017 The Company had minimal transactions with Zedge, Inc. (“Zedge”) related to certain employees of the Company providing services to Zedge. Zedge was a subsidiary of IDT and was spun-off in June 2016 and Howard Jonas is a current director. There is minimal amount due from Zedge at December 31, 2018 and 2017. On August 31, 2018, the Company settled an option issued to an employee to purchase shares of the Company’s various subsidiaries with a net book value of $ 1.0 0.8 0.2 From 2012 2015 0.5 0.5 0.1 0.4 0.1 The New Note requires scheduled payments starting on December 31, 2020 until December 31, 2052. 2017 0.1 The Company obtains insurance policies from several insurance brokers, one 0.3 0.2 2017 There was no outstanding payable to IGM as of December 31, 2018. Neither Howard S. Jonas nor Joyce Mason has any ownership or other interest in IGM other than via the familial relationships with their mother and Jonathan Mason.

Business Segment and Geographic

Business Segment and Geographic Information	12 Months Ended
	Dec. 31, 2018
Business Segment and Geographic Information [Abstract]
Business Segment and Geographic Information	Note 18 The Company owns 99.3 100 92 In the fourth quarter of 2018 1 three Its REP businesses resell electricity and natural gas to residential and small business customers in the Eastern and Midwestern United States. 86.1 2 The Company’s reportable segments are distinguished by types of service, customers and methods used to provide their services. The operating results of these business segments are regularly reviewed by the Company’s chief operating decision maker. The accounting policies of the segments are the same as the accounting policies of the Company as a whole. The Company evaluates the performance of its business segments based primarily on income (loss) from operations. There are no significant asymmetrical allocations to segments. Operating results for the business segments of the Company were as follows: (in thousands) GRE GES GOGAS Corporate Total Year ended December 31, 2018 Revenues $ 274,443 $ 5,696 $ 170 $ — $ 280,309 Income (loss) from operations 27,787 ( 982 ) ( 6,532 ) ( 8,295 ) 11,978 Depreciation and amortization 1,538 178 345 1 2,062 Exploration — — 244 — 244 Impairment of assets — — 2,742 — 2,742 Equity in the net loss of equity method investees 2,990 — 440 — 3,430 Year ended December 31, 2017 Revenues $ 262,318 $ 1,884 $ — $ — $ 264,202 Income (loss) from operations 17,371 ( 785 ) ( 13,291 ) ( 9,835 ) ( 6,540 ) Depreciation and amortization 1,718 22 399 1 2,140 Exploration — — 4,879 — 4,879 Write-off of capitalized exploration costs — — 6,483 — 6,483 Equity in the net loss of Shoreditch 565 — — — 565 Total assets for the business segments of the Company were as follows: (in thousands) GRE GES GOGAS Corporate Total Total assets: December 31, 2018 $ 117,572 $ 11,519 $ 15,375 $ 2,398 $ 146,864 December 31, 2017 110,450 2,071 10,475 2,782 125,778 Geographic Information Revenues from customers located outside of the United States were not material for all periods presented. Net long-lived assets and total assets held outside of the United States, which are located primarily in Israel, were as follows: (in thousands) United States Foreign Countries Total December 31, 2018 Long-lived assets, net $ 20,529 $ 1,409 $ 21,938 Total assets 141,336 5,528 146,864 December 31, 2017 Long-lived assets, net $ 696 $ 3,352 $ 4,048 Total assets 115,605 10,173 125,778

Subsequent Event

Subsequent Event	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	Note 19 Acquisition of Lumo On January 2, 2019, the Company completed the purchase of 80 . Refer to Note 2 Acquisition and Divestiture

Selected Quarterly Financial Da

Selected Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2018
Selected Quarterly Financial Data (Unaudited) [Abstract]
Selected Quarterly Financial Data (Unaudited)	Note 20 The Company is a smaller reporting company as defined by Rule 12b-2 of the Securities and Exchange Act of 1934 and are not required to provide the information under this item.

Description of Business and S_2

Description of Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Description of Business and Summary of Significant Accounting Policies [Abstract]
Description of Business	Description of Business Genie Energy Ltd. (“Genie”), a Delaware corporation, was incorporated in January 2011. Genie owns 99.3 100 100 60 % of Prism Solar Technology, . ("Prism") 97 Genie, owns and operates retail energy providers (“REPs”), including IDT Energy, Inc. (“IDT Energy”), Residents Energy, LLC (“Residents Energy”), Town Square Energy (“TSE”), and Mirabito Natural Gas (“Mirabito”). Its REP businesses resell electricity and natural gas to residential and small business customers in the Eastern and Midwestern United States. Internationally, GRE manages our interest in joint venture that serves retail customers customers in the United Kingdom ('U. K.") and our venture in Japan recently launched commercial operations (see Note 2 6 GES oversees LLC (" "), a retail energy advisory and brokerage company that serves commercial and industrial customers throughout the United States ("U.S.") and manages 60 Prism (see Note 2 GOGAS is an oil and gas exploration company and owns an interest in a contracted drilling services operation. 86.1 GOGAS also holds controlling interests in inactive oil and gas projects. Until September 2018, GOGAS owned 37.5 2 As of December 31, 2018, Genie Retail Energy International, LLC ("GREI"), 4.0 % and 4.5 2020 Seasonality and Weather The weather and the seasons, among other things, affect GRE’s REPs’ revenues. Weather conditions have a significant impact on the demand for natural gas used for heating and electricity used for heating and cooling. Typically, colder winters increase demand for natural gas and electricity, and hotter summers increase demand for electricity. Milder winters and/or summers have the opposite effect. Natural gas revenues typically increase in the first quarter due to increased heating demands and electricity revenues typically increase in the third quarter due to increased air conditioning use. Approximately 50 45 2018 2017 30 2018 2017
Basis of Consolidation	Basis of Consolidation The method of accounting applied to long-term investments, whether consolidated, equity or cost, involves an evaluation of the significant terms of each investment that explicitly grant or suggest evidence of control or influence over the operations of the investee and also includes the identification of any variable interests in which the Company is the primary beneficiary. The consolidated financial statements include the Company’s controlled subsidiaries and the variable interest entity in which the Company is the primary beneficiary (see Note 13 2 Acquisitions and Divestment
Accounting for Investments	Accounting for Investments Investments in businesses that the Company does not control, but in which the Company has the ability to exercise significant influence over operating and financial matters, are accounted for using the equity method. The Company periodically evaluates its equity method investments for impairment due to declines considered to be other than temporary. If the Company determines that a decline in fair value is other than temporary, then a charge to earnings is recorded, and a new basis in the investment is established.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Significant estimates affecting amounts reported or disclosed in the consolidated financial statements include revenues, accounts receivables, allowances for doubtful accounts receivable, net realizable value of inventories, valuation of intangible assets, depreciation and amortization periods for long-lived assets, valuation allowances recorded against deferred tax assets, the valuation of stock-based compensation, valuation of derivative instruments, valuation of debt instruments and loss contingencies. These estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the current circumstances. Actual results may differ from those estimates.
Revenue Recognition	Revenue Recognition Revenue Recognition under ASC 606 Revenues from Sale of Electricity and Natural Gas On January 1, 2018, the Company adopted Accounting Standard Update ("ASU") No. 2014 09 Revenue from Contracts with Customers (Topic 606 606 five The Company adopted ASC 606 606 605 The Company records unbilled revenues for the estimated amount customers will be billed for services rendered from the time meters were last read to the end of the respective accounting period. The unbilled revenue is estimated each month based on available per day usage data, the number of unbilled days in the period adjusted for seasonality based cooling and heating degree-days and historical trends. Utility companies offer purchase of receivable, or POR, programs in most of the service territ The Company’s performance obligations are generally pursuant to contracts for which the estimated customer relationship periods are currently less than one 606 one Revenues from Sale of Solar Panels The revenue sales of solar panels are recognized at a point in time following the transfer of control of the solar panels to the customer, which typically occurs upon shipment or delivery depending on the terms of the underlying contracts. For sales contracts that contain multiple performance obligations, such as the shipment or delivery of solar modules, we allocate the transaction price to each performance obligation identified in the contract based on relative standalone selling prices, or estimates of such prices, and recognize the related revenue as control of each individual product is transferred to the customer, in satisfaction of the corresponding performance obligations. The following table shows the Company’s revenues disaggregated by pricing plans offered to customers: (in thousands) Electricity Natural Gas Other Total For the year ended December 31, 2018 Fixed rate $ 77,383 $ 2,781 $ — $ 80,164 Variable rate 150,500 43,779 — 194,279 Other — — 5,866 5,866 Total $ 227,883 $ 46,560 $ 5,866 $ 280,309 For the year ended December 31, 2017 Fixed rate $ 61,973 $ 1,866 $ — $ 63,839 Variable rate 160,198 38,232 — 198,430 Other — — 1,933 1,933 Total $ 222,171 $ 40,098 $ 1,933 $ 264,202 The following table shows the Company’s revenues disaggregated by non-commercial and commercial channels: (in thousands) Electricity Natural Gas Other Total For the year ended December 31, 2018 Non-Commercial Channel $ 217,019 $ 43,383 $ — $ 260,402 Commercial Channel 10,864 3,177 — 14,041 Other — — 5,866 5,866 Total $ 227,883 $ 46,560 $ 5,866 $ 280,309 For the year ended December 31, 2017 Non-Commercial Channel $ 219,984 $ 37,623 $ — $ 257,607 Commercial Channel 2,187 2,475 — 4,662 Other — — 1,933 1,933 Total $ 222,171 $ 40,098 $ 1,933 $ 264,202 Revenue Recognition Under ASC 605 Until December 31, 2018, revenues from GRE’s sale of electricity and natural gas are recognized under the accrual method based on deliveries of electricity and natural gas to customers. Revenues from electricity and natural gas delivered but not billed are estimated and recorded as accounts receivable. Cash received in advance from customers under billing arrangement is reported as deferred revenue and is included in “Accrued expenses” in the accompanying consolidated balance sheets. GOGAS does not yet generate revenues.
Oil and Gas Exploration Costs	Oil and Gas Exploration Costs The Company accounts for its oil and gas activities under the successful efforts method of accounting. Under this method, the costs of drilling exploratory wells and exploratory-type stratigraphic test wells are capitalized, pending determination of whether the well has found proved reserves. Other exploration costs are charged to expense as incurred. Unproved properties are assessed for impairment, and if considered impaired, are charged to expense when such impairment is deemed to have occurred (see Note 5
Cash, Cash Equivalents and Restricted Cash	Cash, Cash Equivalents and Restricted Cash The Company considers all highly liquid investments with an original maturity of three Restricted cash represents cash that is not available for use in the Company's operations. On January 1, 2018, the Company adopted ASU No. 2016 18 December 31, 2018 2017 (in thousands) Cash and cash equivalents $ 41,601 $ 29,913 Restricted cash—short-term included in other current assets 1,653 518 Restricted cash—long-term 943 1,496 Total cash, cash equivalents, and restricted cash $ 44,197 $ 31,927 Restricted cash—short-term includes amounts set aside in accordance with the Amended and Restated Preferred Supplier Agreement with BP Energy Company (“BP”) (see Note 17 Trade Accounts Receivable, Net Trade accounts receivable, net are reported in the balance sheet as gross outstanding amounts adjusted for doubtful accounts.
Inventories	Inventories Inventory consists of natural gas, renewable energy credits and solar panels. Natural Gas Natural gas inventory is stored at various third parties’ underground storage facilities and is stated at lower of cost or net realizable value. Company’s natural gas inventory was valued at weighted average cost, which was based on the purchase price of the natural gas and the cost to transport, plus or minus injections or withdrawals.
Renewable Energy Credits	Renewable Energy Credits GRE must obtain a certain percentage or amount of its power supply from renewable energy sources in order to meet the requirements of renewable portfolio standards in the states in which it operates. This requirement may be met by obtaining renewable energy credits that provide evidence that electricity has been generated by a qualifying renewable facility or resource. GRE holds renewable energy credits for both sale and use, and treats the credits as a government incentive to encourage the construction of renewable power plants. Renewable energy credits are valued at the lower of cost and market, where cost is the purchase price. Gains and losses from the sale of renewable energy credits are recognized in cost of revenues when the credits are transferred to the buyer. Solar Panels Inventories related to solar panels are stated at the lower of cost or net realizable value. The cost is determine using the first-in, first-out basis and includes both the costs of acquisition and the costs of manufacturing. These costs include direct material, direct labor, and indirect manufacturing costs, including depreciation and amortization. The capitalization of costs into inventory is based on the normal utilization of our plant. If the plant utilization is abnormally low, the portion of the indirect manufacturing costs related to the abnormal utilization level are expensed as incurred. The Company regularly reviews the cost of inventories against their estimated net realizable value and records write-downs if any inventories have costs in excess of their net realizable values. The Company also regularly evaluates the quantities and values of inventories, in light of current market conditions and trends among other factors and records write-downs for any quantities in excess of demand or for any obsolescence. This evaluation considers the use of modules in the systems business, expected demand, anticipated sales prices, strategic raw material requirements, new product development schedules, the effect new products might have on the sale of existing products, product obsolescence, product merchantability, and other factors. Market conditions are subject to change, and actual consumption of our inventory could differ from forecasted demand. Inventories consisted of the following: December 31, 2018 2017 (in thousands) Natural gas $ 1,116 $ 975 Renewable credits 8,654 3,011 Solar Panels: Finished goods 40 — Raw materials 83 — Total solar panels inventory 123 — Totals $ 9,893 $ 3,986
Long-Lived Assets	Long-lived Assets Property, plant and equipment - net is stated at historical cost less accumulated depreciation and any impairment. The Company provides for depreciation using a straight-line method over estimated useful life of the assets. Any leasehold improvements are amortized over the lesser of the lease term or the useful life. The cost of major additions and improvements are capitalized, while maintenance and repair costs that do not improve or extend the lives of the respective assets are charged to operations as incurred. The estimated useful life of property plant and equipment as as follows: Years Building and improvements 4 27 Machinery and equipment 2 9 Computer software and development 2 5 Computers and computer hardware 2 5 Office equipment and other 5 7 The fair value of patents and trademarks, non-compete agreements and customer relationships acquired in a business combination accounted for under the purchase method are amortized over their estimated useful lives as follows: patents and trademarks are amortized on a straight-line basis over 10 to 20 2 2 9 The Company tests the recoverability of its long-lived assets with finite useful lives whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. The Company tests the recoverability based on the projected undiscounted cash flows to be derived from such asset. If the projected undiscounted future cash flows are less than the carrying value of the asset, the Company will record an impairment loss based on excess of carrying value over fair value of the assets. The Company generally measures fair value by considering sale prices for similar assets or by discounting estimated future cash flows from such asset using an appropriate discount rate. Cash flow projections and fair value estimates require significant estimates and assumptions by management. Should the estimates and assumptions prove to be incorrect, the Company may be required to record impairments in future periods and such impairments could be material. Acquisitions Results of operations of acquired companies are included in the Company’s results of operations as of the respective acquisition dates. The purchase price of each acquisition is allocated to the net assets acquired based on estimates of their fair values at the date of the acquisition. Any purchase price in excess of these net assets is recorded as goodwill. The allocation of purchase price in certain cases may be subject to revision based on the final determination of fair values during the measurement period, which may be up to one
Goodwill and Indefinite Lived Intangible Assets	Goodwill and Indefinite Lived Intangible Assets Goodwill is the excess of the acquisition cost of businesses over the fair value of the identifiable net assets acquired. Goodwill and other indefinite lived intangible assets are not amortized. These assets are reviewed annually (or more frequently under various conditions) for impairment using a fair value approach. In the fourth quarter of 2018 one 18 The Company has three four The fair value of the reporting unit is estimated using discounted cash flow methodologies, as well as considering third party market value indicators. Calculating the fair value of the reporting units requires significant estimates and assumptions by management. Should the estimates and assumptions regarding the fair value of the reporting units prove to be incorrect, the Company may be required to record impairments to its goodwill in future periods and such impairments could be material. The Company performed its annual goodwill impairment test as of October 1, 2018. In reviewing goodwill for impairment, the Company has the option, for any or all of its reporting units that carry goodwill - to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not (i.e. greater than 50 Derivative Instruments and Hedging Activities
Derivative Instruments and Hedging Activities	The Company records its derivatives instruments at their respective fair values. The accounting for changes in the fair value (that is, gains or losses) of a derivative instrument is dependent upon whether the derivative has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. Due to the volatility of electricity and natural gas prices, GRE enters into futures contracts, swaps and put and call options as hedges against unfavorable fluctuations in market prices of electricity and natural gas and to reduce exposure from price fluctuations. The Company does not designate its derivative instruments to qualify for hedge accounting, accordingly the futures contracts, swaps and put and call options are recorded at fair value as a current asset or liability and any changes in fair value are recorded in “Cost of revenues” in the consolidated statements of operations. In addition to the above, GRE utilizes forward physical delivery contracts for a portion of its purchases of electricity and natural gas, which are defined as commodity derivative contracts. Using the exemption available for qualifying contracts, GRE applies the normal purchase and normal sale accounting treatment to its forward physical delivery contracts, thereby these contracts are not adjusted to fair value. GRE also applies the normal purchase and normal sale accounting treatment to forward contracts for the physical delivery of electricity in nodal energy markets that result in locational marginal pricing charges or credits, since this does not constitute a net settlement, even when legal title to the electricity is conveyed to the ISO during transmission. Accordingly, GRE recognizes revenue from customer sales, and the related cost of revenues, at the contracted price, as electricity and natural gas is delivered to retail customers. Shipping and Handling Fees and Costs Amounts billed to customers for shipping and handling are included in revenues. The related minimal 0.1 0.2 December 31, 2018 2017
Foreign Currency Translation	Foreign Currency Assets and liabilities of foreign subsidiaries denominated in foreign currencies are translated to U.S. Dollars at end-of-period rates of exchange, and their monthly results of operations are translated to U.S. Dollars at the average rates of exchange for that month. Gains or losses resulting from such foreign currency translations are recorded in “Accumulated other comprehensive income” in the accompanying consolidated balance sheets. Foreign currency transaction gains and losses are reported in “Other (expense) income, net” in the accompanying consolidated statements of operations.
Advertising Expense	Advertising Expense Cost of advertising for customer acquisitions is charged to selling, general and administrative expense in the period in which it is incurred. Most of the advertisements are in print, over the radio, or direct mail. In the years ended December 31, 2018 2017 2.4 2.1
Income Taxes	Income Taxes The Company recognizes deferred tax assets and liabilities for the future tax consequences attributable to temporary differences between the financial statements carrying amounts of existing assets and liabilities and their respective tax bases. A valuation allowance is provided when it is more likely than not that some portion or all of a deferred tax asset will not be realized. The ultimate realization of deferred tax assets depends on the generation of future taxable income during the period in which related temporary differences become deductible. The Company considers the scheduled reversal of deferred tax liabilities, projected future taxable income and tax planning strategies in its assessment of a valuation allowance. Deferred tax assets and liabilities are measured using the enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in income in the period that includes the enactment date of such change. The Company uses a two 50 one The Company classifies interest and penalties on income taxes as a component of income tax expense.
Contingencies	Contingencies The Company accrues for loss contingencies when both (a) information available prior to issuance of the financial statements indicates that it is probable that a liability had been incurred at the date of the financial statements and (b) the amount of loss can reasonably be estimated. When the Company accrues for loss contingencies and the reasonable estimate of the loss is within a range, the Company records its best estimate within the range. When no amount within the range is a better estimate than any other amount, the Company accrues the minimum amount in the range. The Company discloses an estimated possible loss or a range of loss when it is at least reasonably possible that a loss may have been incurred.
Earnings Per Share	Earnings Per Share Basic earnings per share is computed by dividing net income or loss attributable to all classes of common stockholders of the Company by the weighted average number of shares of all classes of common stock outstanding during the applicable period. Diluted earnings per share is determined in the same manner as basic earnings per share, except that the number of shares is increased to include restricted stock still subject to risk of forfeiture and to assume exercise of potentially dilutive stock options using the treasury stock method, unless the effect of such increase is anti-dilutive. The weighted-average number of shares used in the calculation of basic and diluted earnings per share attributable to the Company’s common stockholders consists of the following: Year ended December 31, 2018 2017 (in thousands) Basic weighted-average number of shares $ 25,154 $ 23,531 Effect of dilutive securities Stock options and warrants 130 — Non-vested restricted Class B common stock 411 — Diluted weighted-average number of shares $ 25,695 $ 23,531 The following shares were excluded from the diluted earnings per share computations because their inclusion would have been anti-dilutive: Year ended December 31, (in thousands) 2018 2017 Stock options 341 383 Non-vested restricted Class B common stock — 762 Shares excluded from the calculation of diluted earnings per share 341 1,145 The diluted loss per share equals basic loss per share in the years ended December 31, 2017
Stock-Based Compensation	Stock-Based Compensation The Company recognizes compensation expense for grants of stock-based awards to its employees based on the estimated fair value on the grant date. Stock based awards granted to nonemployees are marked-to-market until the vesting of the award. Compensation cost for awards is recognized using the straight-line method over the requisite service period, which approximates the vesting period. Stock-based compensation is included in selling, general and administrative expense.
Vulnerability Due to Certain Concentrations	Vulnerability Due to Certain Concentrations Financial instruments that potentially subject the Company to concentration of credit risk consist principally of cash, cash equivalents, restricted cash, certificates of deposit and trade accounts receivable. The Company holds cash, cash equivalents and restricted cash at several major financial institutions, which may exceed FDIC insured limits. Historically, the Company has not experienced any losses due to such concentration of credit risk. The Company’s temporary cash investments policy is to limit the dollar amount of investments with any one GRE’s REPs reduce their customer credit risk by participating in purchase of receivable, or POR, programs for a majority of their receivables. In addition to providing billing and collection services, utility companies purchase those REPs’ receivables and assume all credit risk without recourse to those REPs. GRE’s REPs’ primary credit risk is therefore nonpayment by the utility companies. Certain of the utility companies represent significant portions of the Company’s consolidated revenues and consolidated gross trade accounts receivable balance and such concentrations increase the Company’s risk associated with nonpayment by those utility companies. The following table summarizes the percentage of consolidated revenues from customers by utility company that equal or exceed 10 10 Year ended December 31, 2018 2017 Con Edison 11 % 15 % ComEd na % 10 % na – less than 10 The following table summarizes the percentage of consolidated gross trade accounts receivable by utility company that equal or exceed 10 2017 10 December 31, 2018 2017 December 31 2018 2017 Con Edison na % 11 % na – less than 10
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts The allowance for doubtful accounts reflects the Company’s best estimate of probable losses inherent in the accounts receivable balance. The allowance is determined based on known troubled accounts, historical experience and other currently available evidence. Doubtful accounts are written-off upon final determination that the trade accounts will not be collected. The change in the allowance for doubtful accounts was as follows: (in thousands) Balance at beginning of period Additions charged (reversals credited) to expense Additions (deductions) ( 1 Balance at end of period Year ended December 31, 2018 Reserves deducted from accounts receivable: Allowance for doubtful accounts $ 1,099 $ 904 $ — $ 2,003 Year ended December 31, 2017 Reserves deducted from accounts receivable: Allowance for doubtful accounts $ 171 $ 762 $ 166 $ 1,099 ( 1 Primarily uncollectible accounts written off, net of recoveries.
Fair Value Measurements	Fair Value Measurements Fair value of financial and non-financial assets and liabilities is defined as an exit price, which is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The three Level 1 — quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 — quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. Level 3 — unobservable inputs based on the Company’s assumptions used to measure assets and liabilities at fair value. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The assessment of the significance of a particular input to the fair value measurement requires judgment, and may affect the valuation of the assets and liabilities being measured and their placement within the fair value hierarchy.
Accounting Standards Updates	Accounting Standards Updates In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASC 606 1 2 3 4 5 606 In January 2016, the FASB issued ASU No. 2016 01 Recognition and Measurement of Financial Assets and Financial Liabilities 1 2 3 4 In February 2016, the FASB issued ASU No. 2016 02 Leases (Topic 842 12 2016 02 2018 10 842 2018 10 2018 11 842 2018 11 2018 10 2016 02 sixteen 2018 11 840 840 840 840 2018 11 two 2016 02 The Company will adopt the new standard on January 1, 2019. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements, with certain practical expedients available. As a lessee, the most significant impact of the standards relates to the recognition of the ROU assets and lease liabilities for the operating leases in the balance sheet. The Company is in the final process of implementing a new lease accounting policy and updating its controls and procedures for maintaining and accounting for its lease portfolio under the new guidance. Upon adoption of Topic 842 In June 2016, the FASB issued ASU No. 2916 13 Measurement of Credit Losses on Financial Instruments In November 2016, the FASB issued ASU No. 2016 18 Restricted Cash The Company adopted the amendments in this ASU on January 1, 2018. For the year ended December 31, 2 017 0.1 10.0 0.6 2016 18 $ 2.0 11.9 2016 The adoption did not have a material impact on the Company's consolidated balance sheets, results of operations and cash flows, other than the impact discussed above. In January 2017, the FASB issued ASU No. 2017 01 Business Combinations three 1 2 two 2017 01 The Company accounted for the Smile Energy G.K. ("Smile Energy") acquisition as an asset acquisition (see Note 2 Acquisitions and Divestitures The adoption did not have a material impact on the Company's consolidated balance sheets, results of operations and cash flows, other than the impact discussed above. In August 2017, the FASB issued ASU No. 2017 12 Derivatives and Hedging (Topic 815 In June 2018, the FASB issued ASU No. 2018 07 718 718 718 718 1 2 606 In August 2018, the FASB issued ASU No. 2018 13 3 3 In November 2018, the FASB issued ASU No. 2018 13 Targeted Improvements to Related Party Guidance for Variable Interest Entities

Description of Business and S_3

Description of Business and Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Description of Business and Summary of Significant Accounting Policies [Abstract]
Schedule of company's revenue disaggregated by customer, commercial and non commercial	(in thousands) Electricity Natural Gas Other Total For the year ended December 31, 2018 Fixed rate $ 77,383 $ 2,781 $ — $ 80,164 Variable rate 150,500 43,779 — 194,279 Other — — 5,866 5,866 Total $ 227,883 $ 46,560 $ 5,866 $ 280,309 For the year ended December 31, 2017 Fixed rate $ 61,973 $ 1,866 $ — $ 63,839 Variable rate 160,198 38,232 — 198,430 Other — — 1,933 1,933 Total $ 222,171 $ 40,098 $ 1,933 $ 264,202 (in thousands) Electricity Natural Gas Other Total For the year ended December 31, 2018 Non-Commercial Channel $ 217,019 $ 43,383 $ — $ 260,402 Commercial Channel 10,864 3,177 — 14,041 Other — — 5,866 5,866 Total $ 227,883 $ 46,560 $ 5,866 $ 280,309 For the year ended December 31, 2017 Non-Commercial Channel $ 219,984 $ 37,623 $ — $ 257,607 Commercial Channel 2,187 2,475 — 4,662 Other — — 1,933 1,933 Total $ 222,171 $ 40,098 $ 1,933 $ 264,202
Schedule of recpnciliation of cash and restricted cash	December 31, 2018 2017 (in thousands) Cash and cash equivalents $ 41,601 $ 29,913 Restricted cash—short-term included in other current assets 1,653 518 Restricted cash—long-term 943 1,496 Total cash, cash equivalents, and restricted cash $ 44,197 $ 31,927
Summary of inventory	December 31, 2018 2017 (in thousands) Natural gas $ 1,116 $ 975 Renewable credits 8,654 3,011 Solar Panels: Finished goods 40 — Raw materials 83 — Total solar panels inventory 123 — Totals $ 9,893 $ 3,986
Schedule of estimated useful life of property plant and equipment	Years Building and improvements 4 27 Machinery and equipment 2 9 Computer software and development 2 5 Computers and computer hardware 2 5 Office equipment and other 5 7
Schedule of antidilutive shares were excluded from the diluted earnings per share computations	Year ended December 31, 2018 2017 (in thousands) Basic weighted-average number of shares $ 25,154 $ 23,531 Effect of dilutive securities Stock options and warrants 130 — Non-vested restricted Class B common stock 411 — Diluted weighted-average number of shares $ 25,695 $ 23,531 Year ended December 31, (in thousands) 2018 2017 Stock options 341 383 Non-vested restricted Class B common stock — 762 Shares excluded from the calculation of diluted earnings per share 341 1,145
Schedule of percentage of consolidated revenues from customers by utility company and percentage of consolidated gross trade accounts receivable by utility company	Year ended December 31, 2018 2017 Con Edison 11 % 15 % ComEd na % 10 % na – less than 10 December 31 2018 2017 Con Edison na % 11 % na – less than 10
Schedule of change in allowance for doubtful accounts	(in thousands) Balance at beginning of period Additions charged (reversals credited) to expense Additions (deductions) ( 1 Balance at end of period Year ended December 31, 2018 Reserves deducted from accounts receivable: Allowance for doubtful accounts $ 1,099 $ 904 $ — $ 2,003 Year ended December 31, 2017 Reserves deducted from accounts receivable: Allowance for doubtful accounts $ 171 $ 762 $ 166 $ 1,099 ( 1 Primarily uncollectible accounts written off, net of recoveries.

Acquisitions and Divestiture (T

Acquisitions and Divestiture (Tables)	12 Months Ended
	Dec. 31, 2018
Business Acquisition [Line Items]
Schedule of acquisition's purchase price allocations	(in thousands) Cash $ 931 Trade accounts receivable 11 Inventories 1,142 Other current assets 260 Property plant and equipment ( 19 3,564 Intangible assets: Trademark ( 10 290 Patent ( 10 320 Customer contract ( 3 1,400 Goodwill 1,084 Accounts payable accrued expenses ( 1,723 ) Notes payable — ( 63 ) Other current liabilities ( 1,164 ) Notes payable — net of current portion ( 885 ) Noncontrolling interest ( 2,667 ) Net assets $ 2,500 (in thousands) Supplemental information Cash contributed to Prism $ 899 Notes receivable from Prism, including accrued interest, converted to Prism's equity 1,351 Cash payment to previous equity holders of Prism 250 2,500 Notes payable issued to Prism 1,500 Total considerations $ 4,000
Schedule of Business Acquisitions Notes Payable	October 25, 2018 December 31, 2018 (in thousands) 5.95 7,184 $ 918 $ 893 20.00 30 30 948 923 Less: Current maturities 63 923 Noncurrent portion $ 885 $ —
Mirabito Natural Gas [Member]
Business Acquisition [Line Items]
Schedule of acquisition's purchase price allocations	(in thousands) Trade accounts receivable $ 509 Prepaid expenses 60 Non-compete agreement 5 Customer relationships ( 9 1,100 Patents and trademarks 760 Goodwill 1,270 Other assets 465 Trade accounts payable ( 299 ) Accrued expenses ( 2 ) Net assets excluding cash acquired $ 3,868 Supplemental information: Cash paid $ 3,955 Cash acquired ( 87 ) Total consideration, net of cash acquired $ 3,868
Schedule of pro forma information	Year ended December 31, (in thousands) 2018 2017 Total revenues $ 281,847 $ 269,800 Net income (loss) 21,524 ( 9,239 ) Net income (loss) attributable to Genie Energy Ltd. common stockholders 22,511 ( 8,976 ) Earnings (loss) per share attributable to Genie energy Ltd. common stockholders Basic 0.89 0.38 Diluted 0.88 0.38

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Measurements [Abstract]
Schedule of balance of assets and liabilities measured at fair value on a recurring basis	(in thousands) Level 1 ( 1 Level 2 ( 2 Level 3 ( 3 Total December 31, 2018 Assets: Derivative contracts $ 1,107 $ 467 $ — $ 1,574 Liabilities: Derivative contracts $ 2,100 $ 248 $ — $ 2,348 December 31, 2017 Assets: Derivative contracts $ 3,091 $ 1,267 $ — $ 4,358 Liabilities: Derivative contracts $ 693 $ 535 $ — $ 1,228 ( 1 quoted prices in active markets for identical assets or liabilities ( 2 observable inputs other than quoted prices in active markets for identical assets and liabilities ( 3 no observable pricing inputs in the market
Schedule of balance of assets and liabilities	(in thousands) Level 1 ( 1 Level 2 ( 2 Level 3 ( 3 Total December 31, 2018 Impairment of assets $ — $ — $ 2,742 $ 2,742 December 31, 2017 Write-off of capitalized exploration costs $ — $ — $ 6,483 $ 6,483

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments [Abstract]
Summarized volume of GRE's outstanding contracts and options	Commodity Settlement Dates Electricity (In MWH) Natural Gas (In Dth) First quarter 2019 244,032 2,370,000 Second quarter 2019 10,240 338,450 Third quarter 2019 31,360 73,900 Fouth quarter 2019 22,090 1,146,000 First quarter 2020 186,560 1,081,832 Second quarter 2020 5,120 55,800 Third quarter 2020 22,800 26,100 Fouth quarter 2020 5,120 27,650 First quarter 2021 — 27,250 Second quarter 2021 — 21,350 Third quarter 2021 — 15,200 Fourth quarter 2021 — 8,100
Schedule of fair value of outstanding derivative instruments recorded as assets and liability	December 31 (in thousands) 2018 2017 Asset Derivatives Balance Sheet Location Derivatives not designated or not qualifying as hedging instruments: Energy contracts and options (1) Other current assets $ 1,116 $ 4,358 Energy contracts and options Other assets 458 — Total derivatives not designated or not qualifying as a hedging instruments — $ 1,574 $ 4,358 Liability Derivatives Derivatives not designated or not qualifying as hedging instruments: Energy contracts and options (1) Other current liabilities $ 2,028 $ 1,228 Energy Contracts and options Other liabilities 320 — Total derivatives not designated or not qualifying as a hedging instruments — $ 2,348 $ 1,228
Effects of derivative instruments on the consolidated statements of operations	Amount of Gain (Loss) Recognized on Derivatives Year ended December 31, (in thousands) 2018 2017 Derivatives not designated or not qualifying as hedging instruments Location of Loss Recognized on Derivatives Energy contracts and options Cost of revenues $ ( 2,013 ) $ ( 1,291 )

Investment in Equity Method I_2

Investment in Equity Method Investees (Tables)	12 Months Ended
	Dec. 31, 2018
Atid Drilling Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Summary of change in balance of company's investment	Balance, beginning of period $ — Capital contributions 1,000 Equity in net loss ( 440 ) Cumulative foreign currency translation adjustments ( 31 ) Balance, end of period $ 529
Shoreditch [Member]
Schedule of Equity Method Investments [Line Items]
Summary of change in balance of company's investment	For the year ended December 31, 2018 2017 Balance, beginning of period $ 3,450 $ — Capital contributions 1,306 3,970 Cumulative foreign currency translation adjustment ( 87 ) 45 Equity in the net loss ( 2,990 ) ( 565 ) Balance, end of period $ 1,679 $ 3,450

Property and Equipment (Tables)

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
Property and Equipment [Abstract]
Schedule of property and equipment	December 31 (in thousands) 2018 2017 Land $ 230 $ — Building and improvements 2,291 29 Manufacturing equipment 1,403 3,833 Computer software 2,229 1,912 Computers and computer hardware 237 246 Office equipment and other 270 414 6,660 6,434 Less: accumulated depreciation ( 2,359 ) ( 2,414 ) Property and equipment, net $ 4,301 $ 4,020

Goodwill and Other Intangibles

Goodwill and Other Intangibles (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Other Intangibles [Abstract]
Schedule of goodwill	(in thousands) GRE GES Total Balance at January 1, 2017 $ 8,728 $ — $ 8,728 Acquisition of Mirabito (see Note 2 1,270 — 1,270 Balance at December 31, 2017 9,998 — 9,998 Acquisition of Prism (see Note 2 — 1,084 1,084 Balance at December 31, 2018 $ 9,998 $ 1,084 $ 11,082
Schedule of other intangible assets	(in thousands) Weighted Average Amortization Period Gross Carrying Amount Accumulated Amortization Net Balance December 31, 2018 Patents and trademarks 17.3 $ 3,470 $ ( 288 ) $ 3,182 Non-compete agreement 2.0 115 ( 112 ) 3 Customer relationships 4.0 4,612 ( 2,334 ) 2,278 Licenses 10.0 895 ( 37 ) 858 TOTAL $ 9,092 $ ( 2,771 ) $ 6,321 December 31, 2017 Trademark 20.0 $ 2,860 $ ( 135 ) $ 2,725 Non-compete agreement 2.0 115 ( 65 ) 50 Customer relationships 4.4 3,200 ( 1,266 ) 1,934 Licenses — 150 — 150 TOTAL $ 6,325 $ ( 1,466 ) $ 4,859

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Income Taxes [Abstract]
Schedule of components of income (loss) before income taxes	Year ended December 31, (in thousands) 2018 2017 Domestic $ 15,246 $ 7,122 Foreign ( 6,222 ) ( 14,044 ) INCOME (LOSS) BEFORE INCOME TAXES $ 9,024 $ ( 6,922 )
Schedule of components of deferred income tax assets	December 31 (in thousands) 2018 2017 Deferred income tax assets: Bad debt reserve $ 543 $ 302 Accrued expenses 2,629 4,425 State taxes 91 117 Charitable contributions 189 265 Net operating loss 46,632 37,435 Stock options and restricted stock 519 908 Depreciation 6,209 7,026 Total deferred income tax assets 56,812 50,478 Valuation allowance ( 41,187 ) ( 48,337 ) DEFERRED INCOME TAX ASSETS, NET $ 15,625 $ 2,141
Schedule of components of income taxes provision	Year ended December 31, (in thousands) 2018 2017 Current: Federal $ — $ — State and local ( 1,107 ) ( 1,366 ) Foreign — — ( 1,107 ) ( 1,366 ) Deferred: Federal 13,609 — State and local ( 126 ) ( 360 ) Foreign — — ( 13,483 ) ( 360 ) BENEFIT FROM (PROVISION FOR) INCOME TAXES $ 12,376 $ ( 1,726 )
Schedule of income tax reconciliation	Year ended December 31, (in thousands) 2018 2017 U.S. federal income tax benefit at statutory rate $ ( 1,895 ) $ 2,423 Valuation allowance 15,113 11,694 Nondeductible expense ( 12 ) — Foreign tax rate differential 1,493 ( 2,610 ) Tax law change — ( 11,070 ) Deferred income tax adjustment ( 1,093 ) ( 1,250 ) Other ( 81 ) 66 State and local income tax, net of federal benefit ( 1,149 ) ( 979 ) BENEFIT FROM (PROVISION FOR) INCOME TAXES $ 12,376 $ ( 1,726 )
Schedule of change in the valuation allowance for deferred income taxes	(in thousands) Balance at beginning of period Additions charged to costs and expenses Deductions Balance at end of period Year ended December 31, 2018 Reserves for valuation allowances deducted from deferred income taxes, net $ 48,337 $ 7,963 $ ( 15,113 ) $ 41,187 Year ended December 31, 2017 Reserves for valuation allowances deducted from deferred income taxes, net $ 52,978 $ 7,053 $ ( 11,694 ) $ 48,337
Schedule of change in the balance of unrecognized income tax benefits	Year ended December 31, (in thousands) 2018 2017 Balance at beginning of period $ 558 $ 632 Additions based on tax positions related to the current period 98 100 Additions for tax positions of prior periods — 1 Lapses of statutes of limitations ( 223 ) ( 175 ) Balance at end of period $ 433 $ 558

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Stock-Based Compensation [Abstract]
Summary of status of Company's grants of restricted shares of Class B common stock	Number of Non-vested Shares (in thousands) Weighted- Average Grant Date Fair Value Non-vested shares at December 31, 2017 163 $ 6.19 Granted 285 5.30 Vested ( 78 ) 5.44 Forfeited ( 3 ) 5.37 NON-VESTED SHARES AT DECEMBER 31, 2018 367 $ 5.46
Equity compensation plans, valuation assumptions	Average risk-free interest rate 2.6 % Expected dividend yield 6.9 % Expected volatility 55.8 % Expected term 5 yea Weighted-average grant date fair value of options granted $ 1.27
Summary of stock option activity	Number of Options (in thousands) Weighted- Average Exercise Price Weighted- Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2017 383 $ 6.85 3.8 $ — Granted 257 4.34 Exercised — — Cancelled/Forfeited ( 43 ) 6.85 OUTSTANDING AT DECEMBER 31, 2018 597 $ 5.77 3.5 $ 434 EXERCISABLE AT DECEMBER 31, 2018 312 $ 6.85 2.8 $ —

Variable Interest Entity (Table

Variable Interest Entity (Tables)	12 Months Ended
	Dec. 31, 2018
Variable Interest Entity [Abstract]
Schedule of net income (loss) related to CCE and aggregate net funding	Year ended December 31, (in thousands) 2018 2017 Net (loss) income $ ( 1,197 ) $ 112 Aggregate funding (provided by) ( 809 ) 158
Summarized consolidated balance sheet amounts related to CCE	December 31 (in thousands) 2018 2017 ASSETS Cash and cash equivalents $ 70 $ 83 Trade accounts receivable 623 1,031 Prepaid expenses 377 451 Other current assets 34 31 Other assets 359 439 TOTAL ASSETS $ 1,463 $ 2,035 LIABILITIES AND NONCONTROLLING INTERESTS Current liabilities $ 513 $ 698 Due to IDT Energy 1,949 1,140 Noncontrolling interests from CCE ( 999 ) 197 TOTAL LIABILITIES AND NONCONTROLLING INTERESTS $ 1,463 $ 2,035

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Summary of accumulated balances for other comprehensive income	(in thousands) Foreign currency translation Balance at December 31, 2016 $ 1,465 Other comprehensive income attributable to Genie 1,580 Balance at December 31, 2017 3,045 Other comprehensive loss attributable to Genie ( 454 ) Balance at December 31, 2018 $ 2,591

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies [Abstract]
Schedule of purchase commitments outstanding	(in thousands) Year ending December 31: 2019 $ 68,088 2020 35,655 2021 3,551 2022 547 Total payments $ 107,841
Schedule of future minimum payments for operating leases	(in thousands) Year ending December 31: 2019 $ 527 2020 428 2021 377 2022 217 2023 221 Thereafter 1,530 Total payments $ 3,300

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2018
Related Party Transactions [Abstract]
Summary of related party transactions	Year ended December 31, (in thousands) 2018 2017 Amount IDT charged the Company $ 1,340 $ 1,773 Amount the Company charged IDT $ 355 $ 471 Amount Rafael charged the Company $ 161 $ —
Schedule of receivables and payables	December 31, (in thousands) 2018 2017 Due to IDT $ 267 $ 1,773 Due from IDT $ 33 $ 471 Due to Rafael $ — $ —

Business Segment and Geograph_2

Business Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2018
Business Segment and Geographic Information [Abstract]
Summary of operating results for the business segments	(in thousands) GRE GES GOGAS Corporate Total Year ended December 31, 2018 Revenues $ 274,443 $ 5,696 $ 170 $ — $ 280,309 Income (loss) from operations 27,787 ( 982 ) ( 6,532 ) ( 8,295 ) 11,978 Depreciation and amortization 1,538 178 345 1 2,062 Exploration — — 244 — 244 Impairment of assets — — 2,742 — 2,742 Equity in the net loss of equity method investees 2,990 — 440 — 3,430 Year ended December 31, 2017 Revenues $ 262,318 $ 1,884 $ — $ — $ 264,202 Income (loss) from operations 17,371 ( 785 ) ( 13,291 ) ( 9,835 ) ( 6,540 ) Depreciation and amortization 1,718 22 399 1 2,140 Exploration — — 4,879 — 4,879 Write-off of capitalized exploration costs — — 6,483 — 6,483 Equity in the net loss of Shoreditch 565 — — — 565
Summary of total assets for the business segments	(in thousands) GRE GES GOGAS Corporate Total Total assets: December 31, 2018 $ 117,572 $ 11,519 $ 15,375 $ 2,398 $ 146,864 December 31, 2017 110,450 2,071 10,475 2,782 125,778
Schedule of net long-lived assets and total assets held outside of the United States	(in thousands) United States Foreign Countries Total December 31, 2018 Long-lived assets, net $ 20,529 $ 1,409 $ 21,938 Total assets 141,336 5,528 146,864 December 31, 2017 Long-lived assets, net $ 696 $ 3,352 $ 4,048 Total assets 115,605 10,173 125,778

Description of Business and S_4

Description of Business and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Fixed rate	$ 80,164	$ 63,839
Variable rate	194,279	198,430
Other	5,866	1,933
Total	280,309	264,202
Electricity [Member]
Disaggregation of Revenue [Line Items]
Fixed rate	77,383	61,973
Variable rate	150,500	160,198
Other
Total	227,883	222,171
Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Fixed rate	2,781	1,866
Variable rate	43,779	38,232
Other
Total	46,560	40,098
Others [Member]
Disaggregation of Revenue [Line Items]
Fixed rate
Variable rate
Other	5,866	1,933
Total	$ 5,866	$ 1,933

Description of Business and S_5

Description of Business and Summary of Significant Accounting Policies (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Non-Commercial Channel	$ 260,402	$ 257,607
Commercial Channel	14,041	4,662
Other	5,866	1,933
Total	280,309	264,202
Electricity [Member]
Disaggregation of Revenue [Line Items]
Non-Commercial Channel	217,019	219,984
Commercial Channel	10,864	2,187
Other
Total	227,883	222,171
Natural Gas [Member]
Disaggregation of Revenue [Line Items]
Non-Commercial Channel	43,383	37,623
Commercial Channel	3,177	2,475
Other
Total	46,560	40,098
Others [Member]
Disaggregation of Revenue [Line Items]
Non-Commercial Channel
Commercial Channel
Other	5,866	1,933
Total	$ 5,866	$ 1,933

Description of Business and S_6

Description of Business and Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Description of Business and Summary of Significant Accounting Policies [Abstract]
Cash and cash equivalents	$ 41,601	$ 29,913
Restricted cash-short-term included in other current assets	1,653	518
Restricted cash-long-term	943	1,496
Total cash, cash equivalents, and restricted cash	$ 44,197	$ 31,927	$ 47,052

Description of Business and S_7

Description of Business and Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Description of Business and Summary of Significant Accounting Policies [Abstract]
Natural gas	$ 1,116	$ 975
Renewable credits	8,654	3,011
Solar Panels
Finished goods	40
Raw materials	83
Total solar panels inventory	123
Totals	$ 9,893	$ 3,986

Description of Business and S_8

Description of Business and Summary of Significant Accounting Policies (Details 4)	12 Months Ended
	Dec. 31, 2018
Building Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	27 years
Building Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	4 years
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	9 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Computer Software And Development [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Computer Software And Development [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Computers and computer hardware [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Computers and computer hardware [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	2 years
Office equipment and other [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	7 years
Office equipment and other [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life	5 years

Description of Business and S_9

Description of Business and Summary of Significant Accounting Policies (Details 5) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Description of Business and Summary of Significant Accounting Policies [Abstract]
Basic weighted-average number of shares	25,154	23,531
Effect of dilutive securities
Stock options and warrants	130
Non-vested restricted Class B common stock	$ 411
Diluted weighted-average number of shares	25,695	23,531

Description of Business and _10

Description of Business and Summary of Significant Accounting Policies (Details 6) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculation of diluted earnings per share	341	1,145
Stock options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculation of diluted earnings per share	341	383
Non-vested restricted Class B common stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from the calculation of diluted earnings per share		762

Description of Business and _11

Description of Business and Summary of Significant Accounting Policies (Details 7)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Con Edison [Member] | Consolidated revenues [Member]
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	15.00%
Con Edison [Member] | Consolidated gross trade accounts receivable [Member]
Concentration Risk [Line Items]
Concentration risk percentage		11.00%
ComEd [Member] | Consolidated revenues [Member]
Concentration Risk [Line Items]
Concentration risk percentage		10.00%

Description of Business and _12

Description of Business and Summary of Significant Accounting Policies (Details 8) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 1,099	$ 171
Additions charged (reversals credited) to expense	904	762
Additions (deductions)		166
Balance at end of period	$ 2,003	$ 1,099

Description of Business and _13

Description of Business and Summary of Significant Accounting Policies (Details Textual) $ in Millions	1 Months Ended	3 Months Ended				12 Months Ended
	Jun. 07, 2018	Dec. 31, 2018Segment	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Dec. 31, 2018USD ($)Segment	Dec. 31, 2017USD ($)	Oct. 25, 2018	Sep. 01, 2018
Description of Business and Summary of Significant Accounting Policies (Textual)
Company's investment, ownership percentage in subsidiary						100.00%
Amount of advertising expense included in selling general and administrative expense | $						$ 2.4	$ 2.1
Description of percentage of consolidated revenue from utility companies						The percentage of consolidated revenues from customers by utility company that equal or exceed 10% of consolidated revenues in the period (no other single utility company accounted for more than 10% of consolidated revenues in these periods.
Description of percentage of consolidated gross trade accounts receivable by utility companies						The percentage of consolidated gross trade accounts receivable by utility company that equal or exceed 10% of consolidated gross trade accounts receivable at December 31, 2018 and 2017.
Purchase method, description						The fair value of patents and trademarks, non-compete agreements and customer relationships acquired in a business combination accounted for under the purchase method are amortized over their estimated useful lives as follows: patents and trademarks are amortized on a straight-line basis over the 20-year period of expected cash flows; non-compete agreements are amortized on a straight-line basis over their 2 year term; and customer relationships are amortized ratably over the 2 or 9 year period of expected cash flows.
Amortization period	10 years
Percentage of electricity revenue generated in given period			30.00%		30.00%
Percentage of gas revenue generated in given period				50.00%			45.00%
Percentage of outstanding membership interests								60.00%
Number of reportable segments						3
Distribution and handling costs | $						$ 0.1	$ 0.2
Restricted cash, description						The Company adopted the amendments in this ASU on January 1, 2018. For the year ended December 31, 2017, $8.1 million and $10.0 million of changes in restricted cash balances that was previously presented within operating and financing activities, respectively, in the consolidated statement of cash flows has been excluded from the cash flows used in operating and financing activities and the effect of exchange rate changes increased by $0.5 million due to the retrospective adoption of ASU 2016-18. Restricted cash amounting to $2.5 million and $11.9 million at December 31, 2017 and 2016, respectively, have been included with the cash and cash equivalents when reconciling the beginning of year and end of year total amounts on the consolidated statement of cash flows for the year ended December 31, 2017.
Percentage of divestiture interest			37.50%
Atid Drilling Ltd. [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Percentage of divestiture interest									37.50%
Customer Relationships [Member] | Maximum [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Amortization period						9 years
Customer Relationships [Member] | Minimum [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Amortization period						2 years
Patents and trademarks [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Amortization period						20 years
Non-compete agreement [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Amortization period						2 years
Genie Retail Energy [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Company's investment, ownership percentage in subsidiary						100.00%
Afek Oil and Gas, Ltd. [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Company's investment, ownership percentage in subsidiary						86.10%
Number of reportable segments		1
Genie Energy International Corporation [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Company's investment, ownership percentage in subsidiary						99.30%
GOGAS [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Number of reportable segments		1
GEIC and GRES [Member] | Maximum [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Company's investment, ownership percentage in subsidiary						4.50%
GEIC and GRES [Member] | Minimum [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Company's investment, ownership percentage in subsidiary						4.00%
GES [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Company's investment, ownership percentage in subsidiary						97.00%
Prism Solar Technology, Inc. [Member]
Description of Business and Summary of Significant Accounting Policies (Textual)
Company's investment, ownership percentage in subsidiary						60.00%

Acquisitions and Divestiture (D

Acquisitions and Divestiture (Details) - USD ($) $ in Thousands	Oct. 25, 2018	Aug. 10, 2017	Oct. 25, 2018	Dec. 31, 2018
Supplemental information:
Cash contributed to Prism/Cash paid		$ 3,955
Considerations gross/Cash acquired			$ (1,100)
Total consideration, net of cash acquired	$ 4,000
Prism panels [Member]
Business Acquisition [Line Items]
Cash	931		931
Trade accounts receivable	11		11
Customer relationships	1,400		1,400
Inventory	1,142		1,142
Other current assets	260		260
Property and equipment	3,564		3,564
Trademark	290		290
Patents	320		320
Goodwill	1,084		1,084
Accounts payable accrued expenses	(1,723)		(1,723)
Notes payable — current portion	(63)		(63)
Other current liabilities	(1,164)		(1,164)
Notes payable — net of current portion	(885)		(885)
Noncontrolling interest	(2,667)		(2,667)
Net assets	$ 2,500		2,500
Supplemental information:
Cash contributed to Prism/Cash paid			899
Notes receivable from Prism, including accrued interest, converted to Prism's equity			1,351
Cash payment to previous equity holders of Prism			250
Considerations gross/Cash acquired			(2,500)
Notes payable issued to Prism			1,500
Total consideration, net of cash acquired			$ 4,000
Mirabito Natural Gas [Member]
Business Acquisition [Line Items]
Trade accounts receivable		509
Prepaid expenses		60
Non-compete agreement		5
Customer relationships		1,100
Patents and trademarks		760
Goodwill		1,270
Other assets		465
Trade accounts payable		(299)
Accrued expenses		(2)
Net assets excluding cash acquired		3,868
Supplemental information:
Considerations gross/Cash acquired		(87)
Total consideration, net of cash acquired		$ 3,868

Acquisitions and Divestiture _2

Acquisitions and Divestiture (Details 1) - Prism panels [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Oct. 25, 2018
Business Acquisition [Line Items]
5.95% note payable, due in monthly payments of $7,184 including interest, through November 2019 when the balloon payment is due, collateralized by Prism's assets	$ 893	$ 918
20.00% demand note payable, uncollaterlized	30	30
Total maturities	923	948
Less: Current maturities	923	63
Noncurrent portion		$ 885

Acquisitions and Divestiture _3

Acquisitions and Divestiture (Details 2) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Total revenues	$ 3,300
Net income (loss) attributable to Genie Energy Ltd. common stockholders	$ 21,400	$ (8,648)
Earnings (loss) per share
Basic	$ 0.85	$ (0.36)
Diluted	$ 0.83	$ (0.36)
Acquisition Of Mirabito Natural Gas [Member]
Business Acquisition [Line Items]
Total revenues	$ 281,847	$ 269,800
Net income (loss)	21,524	(9,239)
Net income (loss) attributable to Genie Energy Ltd. common stockholders	$ 22,511	$ (8,976)
Earnings (loss) per share
Basic	$ 0.89	$ 0.38
Diluted	$ 0.88	$ 0.38

Acquisitions and Divestiture _4

Acquisitions and Divestiture (Details Textual) - USD ($)

Jan. 02, 2019

Oct. 25, 2018

Aug. 10, 2017

Oct. 25, 2018

Jun. 07, 2018

Oct. 31, 2018

Dec. 31, 2018

Dec. 31, 2017

Dec. 17, 2018

Sep. 30, 2018

Sep. 01, 2018

Sep. 30, 2017

Acquisitions (Textual)

Aggregate cash payment

$ 1,100,000

Additional amount to be paid

1,500,000

Amortization period

10 years

Bridge Loan

$ 1,400,000

$ 1,400,000

Percentage of acquire controlling interest

60.00%

60.00%

Business Combination, Consideration Transferred

$ 4,000,000

Business Acquisition, Pro Forma Revenue

$ 3,300,000

Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage

80.00%

Percentage of divestiture interest

37.50%

Equity of net book value

$ 500,000

Property, Plant and Equipment [Member]

Acquisitions (Textual)

Property, Plant and Equipment, Useful Life

19 years

Trade Names [Member]

Acquisitions (Textual)

Property, Plant and Equipment, Useful Life

10 years

Letter of Credit [Member]

Acquisitions (Textual)

Working capital

$ 400,000

Howard Jonas [Member]

Acquisitions (Textual)

Percentage of divestiture interest

37.50%

Chief Financial Officer [Member]

Acquisitions (Textual)

Percentage of divestiture interest

25.00%

Atid Drilling Ltd. [Member]

Acquisitions (Textual)

Assets held for sale

$ 2,700,000

Percentage of divestiture interest

37.50%

Equity of net book value

$ 1,000,000

Smile Energy G.K. [Member]

Acquisitions (Textual)

Annual management fee business profit percentage

5.00%

Acquisitions purchase price

$ 700,000

Exercise price

$ 1

Acquisition of Option Exchange Payment

$ 300,000

Lumo Energia, Ojy [Member] | Subsequent Event [Member]

Acquisitions (Textual)

Percentage of acquire controlling interest

20.00%

Acquisition of purchase agreement

The Company completed the purchase of 80% controlling interest of Lumo. The Company paid the Seller €1.3 million (equivalent to $1.4 million) and paid €0.2 million (equivalent to $0.2 million) to repay a portion of Lumo's outstanding debt. The Company contributed €1.5 million (equivalent to $1.7 million) as a capital loan to fund Lumo's working capital requirements and provided Lumo with a secured loan for €2.0 million (equivalent to $2.3 million) to pay off and replace its remaining debt. The secured loan is payable in 4 years at annual interest rate of 4.0%, which is payable on a monthly basis. The Company also issued 176,104 of the Company’s Class B common stock to the Sellers which are subject to restrictions as described in the Lumo Purchase Agreement (“Restricted Shares”). The Restricted shares are subject to vesting conditions related to employment and services to be provided by the Sellers of up to three years as described in the Lumo Purchase Agreement.

Vesting interest rate

7.50%

Lumo Energia, Ojy [Member] | Subsequent Event [Member] | Three Annual Installment [Member]

Acquisitions (Textual)

Vesting interest rate

12.50%

Customer Relationships [Member]

Acquisitions (Textual)

Property, Plant and Equipment, Useful Life

3 years

Patents [Member]

Acquisitions (Textual)

Property, Plant and Equipment, Useful Life

10 years

Management Agreement [Member]

Acquisitions (Textual)

Management fee termination date

Aug. 31, 2021

Annual management fee business profit percentage

30.00%

Annual management fee minimum

$ 250,000

Prism [Member]

Acquisitions (Textual)

Bridge Loan

$ 1,300,000

Fixed annual interest rate

12.00%

Note payable interest rate

5.95%

Due payment of notes payable

$ 7,184,000

Demand note payable interest

20.00%

Mirabito Natural Gas [Member]

Acquisitions (Textual)

Aggregate cash payment

$ 4,000,000

Business Acquisition, Pro Forma Revenue

$ 281,847,000

$ 269,800,000

Mirabito Natural Gas [Member] | Customer Relationships [Member]

Acquisitions (Textual)

Amortization period

9 years

Fair Value Measurements (Detail

Fair Value Measurements (Details) - Recurring [Member] - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Assets:
Derivative contracts		$ 1,574	$ 4,358
Liabilities:
Derivative contracts		2,348	1,228
Level 1 [Member]
Assets:
Derivative contracts	[1]	1,107	3,091
Liabilities:
Derivative contracts	[1]	2,100	693
Level 2 [Member]
Assets:
Derivative contracts	[2]	467	1,267
Liabilities:
Derivative contracts	[2]	248	535
Level 3 [Member]
Assets:
Derivative contracts	[3]
Liabilities:
Derivative contracts	[3]
[1]	quoted prices in active markets for identical assets or liabilities
[2]	observable inputs other than quoted prices in active markets for identical assets and liabilities
[3]	no observable pricing inputs in the market

Fair Value Measurements (Deta_2

Fair Value Measurements (Details 1) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges		$ 2,742
Write-off of capitalized exploration costs			6,483
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	[1]
Write-off of capitalized exploration costs	[1]
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	[2]
Write-off of capitalized exploration costs	[2]
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset Impairment Charges	[3]	$ 2,742
Write-off of capitalized exploration costs	[3]		$ 6,483
[1]	quoted prices in active markets for identical assets or liabilities
[2]	observable inputs other than quoted prices in active markets for identical assets and liabilities
[3]	no observable pricing inputs in the market

Fair Value Measurements (Deta_3

Fair Value Measurements (Details Textual) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Fair Value Measurements (Textual)
Financial instrument included in other assets	$ 0.5	$ 0.6

Derivative Instruments (Details

Derivative Instruments (Details)	12 Months Ended
	Dec. 31, 2018
Electricity (In MWH) [Member] | First quarter 2019 [Member]
Derivative [Line Items]
Volume	244,032
Electricity (In MWH) [Member] | Second quarter 2019 [Member]
Derivative [Line Items]
Volume	10,240
Electricity (In MWH) [Member] | Third quarter 2019 [Member]
Derivative [Line Items]
Volume	31,360
Electricity (In MWH) [Member] | Fourth quarter 2019 [Member]
Derivative [Line Items]
Volume	22,090
Electricity (In MWH) [Member] | First quarter 2020 [Member]
Derivative [Line Items]
Volume	186,560
Electricity (In MWH) [Member] | Second quarter 2020 [Member]
Derivative [Line Items]
Volume	5,120
Electricity (In MWH) [Member] | Third quarter 2020 [Member]
Derivative [Line Items]
Volume	22,800
Electricity (In MWH) [Member] | Fourth quarter 2020 [Member]
Derivative [Line Items]
Volume	5,120
Electricity (In MWH) [Member] | First quarter 2021 [Member]
Derivative [Line Items]
Volume
Electricity (In MWH) [Member] | Second quarter 2021 [Member]
Derivative [Line Items]
Volume
Electricity (In MWH) [Member] | Third quarter 2021 [Member]
Derivative [Line Items]
Volume
Electricity (In MWH) [Member] | Fourth quarter 2021 [Member]
Derivative [Line Items]
Volume
Natural gas (in Dth) [Member] | First quarter 2019 [Member]
Derivative [Line Items]
Volume	2,370,000
Natural gas (in Dth) [Member] | Second quarter 2019 [Member]
Derivative [Line Items]
Volume	338,450
Natural gas (in Dth) [Member] | Third quarter 2019 [Member]
Derivative [Line Items]
Volume	73,900
Natural gas (in Dth) [Member] | Fourth quarter 2019 [Member]
Derivative [Line Items]
Volume	1,146,000
Natural gas (in Dth) [Member] | First quarter 2020 [Member]
Derivative [Line Items]
Volume	1,081,832
Natural gas (in Dth) [Member] | Second quarter 2020 [Member]
Derivative [Line Items]
Volume	55,800
Natural gas (in Dth) [Member] | Third quarter 2020 [Member]
Derivative [Line Items]
Volume	26,100
Natural gas (in Dth) [Member] | Fourth quarter 2020 [Member]
Derivative [Line Items]
Volume	27,650
Natural gas (in Dth) [Member] | First quarter 2021 [Member]
Derivative [Line Items]
Volume	27,250
Natural gas (in Dth) [Member] | Second quarter 2021 [Member]
Derivative [Line Items]
Volume	21,350
Natural gas (in Dth) [Member] | Third quarter 2021 [Member]
Derivative [Line Items]
Volume	15,200
Natural gas (in Dth) [Member] | Fourth quarter 2021 [Member]
Derivative [Line Items]
Volume	8,100

Derivative Instruments (Detai_2

Derivative Instruments (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018		Dec. 31, 2017
Schedule of fair value of outstanding derivative instruments recorded as assets and liability
Asset Derivatives, not designated or not qualifying as hedging instruments	$ 1,574		$ 4,358
Liability Derivatives, not designated or not qualifying as hedging instruments	2,348		1,228
Energy contracts and options [Member] | Other current assets [Member]
Schedule of fair value of outstanding derivative instruments recorded as assets and liability
Asset Derivatives, not designated or not qualifying as hedging instruments	1,116	[1]	4,358
Energy contracts and options [Member] | Other Assets [Member]
Schedule of fair value of outstanding derivative instruments recorded as assets and liability
Asset Derivatives, not designated or not qualifying as hedging instruments	458
Energy contracts and options [Member] | Other current liabilities [Member]
Schedule of fair value of outstanding derivative instruments recorded as assets and liability
Liability Derivatives, not designated or not qualifying as hedging instruments	2,028		1,228
Energy contracts and options [Member] | Other Liabilities [Member]
Schedule of fair value of outstanding derivative instruments recorded as assets and liability
Liability Derivatives, not designated or not qualifying as hedging instruments	$ 320
[1]	The Company classifies derivative assets and liabilities as current based on the cash flows expected to be incurred within the following 12 months.

Derivative Instruments (Detai_3

Derivative Instruments (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Energy contracts and options [Member] | Cost of revenues [Member]
Effects of derivative instruments on the consolidated statements of operations
Amount of Loss Recognized on Derivatives	$ (2,013)	$ (1,291)

Afek Oil and Gas Exploration _2

Afek Oil and Gas Exploration Activities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)Wells	Apr. 30, 2018Wells
Afek Oil and Gas Exploration Activities (Textual)
Write-off of capitalized exploration costs | $		$ 6,483
Number of wells | Wells			5
Afek Oil and Gas, Ltd. [Member]
Afek Oil and Gas Exploration Activities (Textual)
Write-off of capitalized exploration costs | $		$ 6,500	$ 41,000
Number of wells | Wells				10

Investment In Equity Method I_3

Investment In Equity Method Investees (Details) - USD ($) $ in Thousands	4 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Balance, beginning of period		$ 3,450
Capital contributions		1,306	$ 3,970
Equity in the net loss		(3,430)	(565)
Balance, end of period	$ 2,208	2,208	3,450
Atid Drilling Ltd. [Member]
Schedule of Equity Method Investments [Line Items]
Balance, beginning of period
Capital contributions	1,000
Cumulative foreign currency translation adjustment	(31)
Equity in the net loss	(440)
Balance, end of period	529	529
Shoreditch [Member]
Schedule of Equity Method Investments [Line Items]
Balance, beginning of period		3,450
Capital contributions		1,306	3,970
Cumulative foreign currency translation adjustment		(87)	45
Equity in the net loss		(2,990)	(565)
Balance, end of period	$ 1,679	$ 1,679	$ 3,450

Investment In Equity Method I_4

Investment In Equity Method Investees (Details Textual) - USD ($) $ in Thousands	Aug. 31, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018	Dec. 31, 2016
Business Acquisition [Line Items]
Investment in joint venture				$ 1,306	$ 3,970
Allocated to goodwill		$ 11,082	$ 11,082	11,082	9,998		$ 8,728
Goodwill				$ 1,084	1,270
Subsidiary or Equity Method Investee, Cumulative Percentage Ownership after All Transactions				100.00%
Debt Instrument, Increase, Accrued Interest	$ 100
Atid Drilling Ltd. [Member]
Business Acquisition [Line Items]
Investment in joint venture			$ 1,000
Percentage of ownership		37.50%	37.50%	37.50%
Equity Method Investment, Ownership Percentage		37.50%	37.50%	37.50%
Shoreditch [Member]
Business Acquisition [Line Items]
Investment in joint venture				$ 1,306	$ 3,970
Loss on investment		$ 1,700	$ 1,700	1,700
Shoreditch [Member] | Maximum [Member]
Business Acquisition [Line Items]
Percentage of ownership						67.00%
Equity Method Investment, Ownership Percentage						67.00%
Shoreditch [Member] | Minimum [Member]
Business Acquisition [Line Items]
Percentage of ownership						65.00%
Equity Method Investment, Ownership Percentage						65.00%
GEUK [Member]
Business Acquisition [Line Items]
Gain on consolidation of AMSO, LLC			$ 1,300
Investment in joint venture				$ 5,300
EGC [Member]
Business Acquisition [Line Items]
Related party loan		$ 200
Debt Instrument, Interest Rate, Stated Percentage		2.00%	2.00%	2.00%
Debt Instrument, Increase, Accrued Interest		$ 200
EGC [Member] | Maximum [Member]
Business Acquisition [Line Items]
Percentage of ownership						35.00%
Equity Method Investment, Ownership Percentage						35.00%
EGC [Member] | Minimum [Member]
Business Acquisition [Line Items]
Percentage of ownership						33.00%
Equity Method Investment, Ownership Percentage						33.00%

Property and Equipment (Details

Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 6,660	$ 6,434
Less: accumulated depreciation	(2,359)	(2,414)
Property and equipment, net	4,301	4,020
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	230
Building and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,291	29
Manufacturing equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,403	3,833
Computer software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,229	1,912
Computers and computer hardware [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	237	246
Office equipment and other [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 270	$ 414

Property and Equipment (Detai_2

Property and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Property and equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 0.8	$ 0.8

Goodwill and Other Intangible_2

Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Beginning Balance	$ 9,998	$ 8,728
Acquisition of Mirabito and Prism (see Note 2)	1,084	1,270
Ending Balance	11,082	9,998
GRE [Member]
Beginning Balance	9,998	8,728
Acquisition of Mirabito and Prism (see Note 2)		1,270
Ending Balance	9,998	9,998
GES [Member]
Beginning Balance
Acquisition of Mirabito and Prism (see Note 2)	1,084
Ending Balance	$ 1,084

Goodwill and Other Intangible_3

Goodwill and Other Intangibles (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period
Gross Carrying Amount	$ 9,092	$ 6,325
Accumulated Amortization	(2,771)	(1,466)
Net Balance	$ 6,321	$ 4,859
Patents and trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	17 years 3 months 18 days	20 years
Gross Carrying Amount	$ 3,470	$ 2,860
Accumulated Amortization	(288)	(135)
Net Balance	$ 3,182	$ 2,725
Non-compete agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	2 years	2 years
Gross Carrying Amount	$ 115	$ 115
Accumulated Amortization	(112)	(65)
Net Balance	$ 3	$ 50
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	4 years	4 years 4 months 24 days
Gross Carrying Amount	$ 4,612	$ 3,200
Accumulated Amortization	(2,334)	(1,266)
Net Balance	$ 2,278	$ 1,934
Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period	10 years
Gross Carrying Amount	$ 895	$ 150
Accumulated Amortization	(37)
Net Balance	$ 858	$ 150

Goodwill and Other Intangible_4

Goodwill and Other Intangibles (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Other Intangibles (Textual)
Amortization expense of intangible assets	$ 1.3	$ 1.3
Amortization expense of finite lives intangible assets, 2019	0.9
Amortization expense of finite lives intangible assets, 2020	0.9
Amortization expense of finite lives intangible assets, 2021	0.9
Amortization expense of finite lives intangible assets, 2022	0.4
Amortization expense of finite lives intangible assets, 2023	0.4
Amortization expense of finite lives intangible assets, 2024	$ 2.8

Revolving Lines of Credit (Deta

Revolving Lines of Credit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	May 31, 2017	Apr. 04, 2017	Dec. 31, 2016
Revolving Lines of Credit (Textual)
Revolving loan facility	$ 2,516	$ 2,513
Settlement of obligations		12,655
Gain from revolving loan facility	164
Notes payable	923
JPMorgan [Member]
Revolving Lines of Credit (Textual)
Maximum principal amount on revolving line of credit	$ 25,000
Description of line of credit collateral	Equal to the greater of (a) $10.0 million or (b) the sum of the amount of letters of credit outstanding plus the outstanding principal under the revolving note.
Maximum amount of collateral under condition one	$ 10,000
Interest rate on principal outstanding, description	Lesser of (a) the LIBOR rate multiplied by the statutory reserve rate established by the Board of Governors of the Federal Reserve System plus 1.0% per annum, or (b) the maximum rate per annum permitted by whichever of applicable federal or Texas laws permit the higher interest rate.
Maturity date	May 31, 2017
Quarterly unused commitment fee	1.00%
Line of credit facility, frequency of payment and payment terms	Interest was payable at least every three months
Cash collateral for line of credit					$ 10,000
Cash collateral released			$ 10,000
Line of credit facility, amount outstanding					$ 8,100
Vantage Commodities Financial Services II, LLC [Member] | GRE [Member]
Revolving Lines of Credit (Textual)
Effective interest rate	7.24%	5.99%
Vantage Commodities Financial Services II, LLC [Member] | GRE Credit Agreement [Member]
Revolving Lines of Credit (Textual)
Revolving loan facility	$ 2,500
Maximum principal amount on revolving line of credit				$ 20,000
Interest rate on principal outstanding, description	Outstanding principal amount incurs interest at LIBOR plus 4.5% per annum.
Maturity date	Apr. 3, 2020

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of components of (loss) income before income taxes
Domestic	$ 15,246	$ 7,122
Foreign	(6,222)	(14,044)
LOSS BEFORE INCOME TAXES	$ 9,024	$ (6,922)

Income Taxes (Details 1)

Income Taxes (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets:
Bad debt reserve	$ 543	$ 302
Accrued expenses	2,629	4,425
State taxes	91	117
Charitable contributions	189	265
Net operating loss	46,632	37,435
Stock options and restricted stock	519	908
Depreciation	6,209	7,026
Total deferred income tax assets	56,812	50,478
Valuation allowance	(41,187)	(48,337)	$ (52,978)
DEFERRED INCOME TAX ASSETS, NET	$ 15,625	$ 2,141

Income Taxes (Details 2)

Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal
State and local	(1,107)	(1,366)
Foreign
Total current income taxes	(1,107)	(1,366)
Deferred:
Federal	13,609
State and local	(126)	(360)
Foreign
Deferred income taxes	(13,483)	(360)
PROVISION FOR INCOME TAXES	$ (12,376)	$ (1,726)

Income Taxes (Details 3)

Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. federal income tax benefit at statutory rate	$ (1,895)	$ 2,423
Valuation allowance	15,113	11,694
Nondeductible expense	(12)
Foreign tax rate differential	1,493	(2,610)
Tax law change		(11,070)
Deferred income tax adjustment	(1,093)	(1,250)
Other	(81)	66
State and local income tax, net of federal benefit	(1,149)	(979)
PROVISION FOR INCOME TAXES	$ (12,376)	$ (1,726)

Income Taxes (Details 4)

Income Taxes (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Summary of change in the valuation allowance for deferred income taxes
Balance at beginning of period	$ 48,337	$ 52,978
Additions charged to costs and expenses	7,963	7,053
Deductions	(15,113)	(11,694)
Balance at end of period	$ 41,187	$ 48,337

Income Taxes (Details 5)

Income Taxes (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Schedule of change in the balance of unrecognized income tax benefits
Balance at beginning of period	$ 558	$ 632
Additions based on tax positions related to the current period	98	100
Additions for tax positions of prior periods		1
Lapses of statutes of limitations	(223)	(175)
Balance at end of period	$ 433	$ 558

Income Taxes (Details Textual)

Income Taxes (Details Textual) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 22, 2017	Dec. 31, 2018
Income Taxes (Textual)
Net operating loss carryforwards		$ 25.7
Minimum [Member]
Income Taxes (Textual)
U.S. tax code, including a reduction in corporate tax rate	21.00%
Maximum [Member]
Income Taxes (Textual)
U.S. tax code, including a reduction in corporate tax rate	35.00%
Unconsolidated Entities [Member]
Income Taxes (Textual)
Net operating loss carryforwards		$ 29.7
Operating loss carryforwards, expiration date		Dec. 31, 2025
U.S. federal [Member]
Income Taxes (Textual)
Net operating loss carryforwards		$ 25.9
Operating loss carryforwards, expiration date		Dec. 31, 2034
U.S. federal [Member] | Minimum [Member]
Income Taxes (Textual)
Income tax returns period		2015
U.S. federal [Member] | Maximum [Member]
Income Taxes (Textual)
Income tax returns period		2018
Foreign [Member]
Income Taxes (Textual)
Net operating loss carryforwards		$ 104.6
Operating loss carry forwards amount no expiration		$ 103.6
Foreign [Member] | Minimum [Member]
Income Taxes (Textual)
Income tax returns period		2014
Foreign [Member] | Maximum [Member]
Income Taxes (Textual)
Income tax returns period		2018
State [Member]
Income Taxes (Textual)
Net operating loss carryforwards		$ 125.3
State [Member] | Minimum [Member]
Income Taxes (Textual)
Operating loss carryforwards, expiration date		Dec. 31, 2030
Income tax returns period		2014
State [Member] | Maximum [Member]
Income Taxes (Textual)
Operating loss carryforwards, expiration date		Dec. 31, 2038
Income tax returns period		2018

Equity (Details)

Equity (Details) - USD ($)	Mar. 06, 2019	Feb. 15, 2019	Jun. 12, 2018	Jun. 08, 2018	Jun. 08, 2018	Jun. 30, 2018	Jul. 30, 2014	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 11, 2013
Equity (Textual)
Common stock dividend								$ 7,774,000	$ 7,427,000
Remaining number of shares available for repurchase									6,900,000
Preferred stock dividend declared								1,481,000	$ 1,481,000
Sales of equity of subsidiaries								6,000,000
Purchases of equity of subsidiary									(312,000)
Receivables for issuance of equity
Warrants exercise price per share			$ 4.77
Warrants expiry term					June 2023			June 2023
Description of sales of shares and warrants			The Company sold to a third-party investor (1) 230,415 treasury shares of the Company’s Class B common stock, at a price of $4.34 per share for an aggregate sales price of $1.0 million, and (2) warrants to purchase an additional 209,644 shares of the Company’s Class B common stock at an exercise price of $4.77 per share for an aggregate exercise price of $1.0 million.
Board of Directors Chairman [Member]
Equity (Textual)
Description of sales of shares and warrants					The Company sold to Howard S. Jonas, the Chairman of the Company’s Board of Directors and a principal owner, (1) 1,152,074 shares of the Company’s Class B common stock, at a price of $4.34 per share for an aggregate sales price of $5.0 million, and (2) warrants to purchase an additional 1,048,218 shares of the Company’s Class B common stock at an exercise price of $4.77 per share for an aggregate exercise price of $5.0 million.
Gogas [Member]
Equity (Textual)
Purchases of equity of subsidiary interest						5.00%
Common stock, Shares						41,667
Gogas [Member] | Maximum [Member]
Equity (Textual)
Ownership acquire interest of company						97.00%
Gogas [Member] | Minimum [Member]
Equity (Textual)
Ownership acquire interest of company						92.00%
Afek Oil and Gas, Ltd. [Member]
Equity (Textual)
Purchases of equity of subsidiary								$ 300,000
Purchases of equity of subsidiary interest								1.15%
Preferred Stock [Member]
Equity (Textual)
Preferred stock dividend rate								$ 0.6376	$ 0.6376	$ 0.6376
Preferred Stock [Member] | Subsequent Event [Member]
Equity (Textual)
Preferred stock dividend rate		$ 0.1594
Record date of declared dividend		Feb. 6, 2019
Common Stock [Member]
Equity (Textual)
Common stock dividend								$ 7,700,000
Class A common stock
Equity (Textual)
Cash dividend paid								$ 0.30	$ 0.30
Common stock, Shares								1,574,000	1,574,000
Class A common stock | Subsequent Event [Member]
Equity (Textual)
Common stock dividends declared	$ 0.075
Paid date of declared dividend	Mar. 25, 2019
Record date of declared dividend	Mar. 29, 2019
Class B common stock
Equity (Textual)
Number of shares repurchased, shares								149,000	129,898
Number of shares repurchased, value								$ 900,000	$ 800,000
Number of stock authorized to be repurchased											7,000,000
Cash dividend paid								$ 0.30	$ 0.30
Commitment to purchase shares							600,000
Commitment to purchase shares price per share							$ 6.82
Purchases of equity of subsidiary
Sale of shares				1,152,074
Sale of shares price per share			$ 4.34	$ 4.34	$ 4.34
Amount of aggregate sales price			$ 1,000	$ 5,000
Warrants to purchase shares			209,644					1,257,862
Warrants exercise price per share								$ 4.77
Amount of warrants aggregate exercise price			$ 1,000
Common stock, Shares								25,544,000	23,601,000
Fair value of shares of common stock						$ 220,000
Treasury shares			230,415
Class B common stock | Howards Jonas [Member]
Equity (Textual)
Commitment to purchase shares							3,600,000
Commitment to purchase shares price per share							$ 6.82
Warrants to purchase shares				1,048,218	1,048,218
Warrants exercise price per share				$ 4.77	$ 4.77
Amount of warrants aggregate exercise price				$ 5,000,000
Class B common stock | Subsequent Event [Member]
Equity (Textual)
Common stock dividends declared	$ 0.075
Paid date of declared dividend	Mar. 25, 2019
Record date of declared dividend	Mar. 29, 2019
Series 2012-A Preferred Stock [Member]
Equity (Textual)
Preferred stock, liquidation preference per share								$ 8.50
Preferred stock dividend rate								$ 0.6375
Preferred stock, dividend payment rate, variable								Seven and one-half percent (7.5%) of the quotient obtained by dividing (A) the amount by which the EBITDA for a fiscal year of the Company's retail energy provider business exceeds $32 million by (B) 8,750,000 (the "Additional Dividend").
Preferred stock, redemption terms								The Preferred Stock is redeemable, in whole or in part, at the option of the Company following October 11, 2017 at 101% of the Liquidation Preference plus accrued and unpaid dividends, and 100% of the Liquidation Preference plus accrued and unpaid dividends following October 11, 2018.
Preferred stock dividend declared								$ 8,750,000

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) - Restricted Stock [Member] shares in Thousands	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Summary of the status of the Company's grants of restricted shares of Class B common stock
Beginning balance, Number of Non-vested Shares | shares	163
Number of Non-vested Shares, Granted | shares	285
Number of Non-vested Shares, Vested | shares	(78)
Number of Non-vested Shares, Forfeited | shares	(3)
Ending balance, Number of Non-vested Shares | shares	367
Beginning balance, Weighted- Average Grant Date Fair Value | $ / shares	$ 6.19
Weighted- Average Grant Date Fair Value, Granted | $ / shares	5.30
Weighted- Average Grant Date Fair Value, Vested | $ / shares	5.44
Weighted- Average Grant Date Fair Value, Forfeited | $ / shares	5.37
Ending balance, Weighted- Average Grant Date Fair Value | $ / shares	$ 5.46

Stock-Based Compensation (Det_2

Stock-Based Compensation (Details 1)	12 Months Ended
	Dec. 31, 2017$ / shares
Equity compensation plans, valuation assumptions
Average risk-free interest rate	2.60%
Expected dividend yield	6.90%
Expected volatility	55.80%
Expected term	5 years
Weighted-average grant date fair value of options granted	$ 1.27

Stock-Based Compensation (Det_3

Stock-Based Compensation (Details 2) - Stock options [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Summary of stock option activity
Number of Options, Outstanding, Beginning Balance	383
Number of Options, Granted	257
Number of Options, Exercised
Number of Options, Cancelled/Forfeited	(43)
Number of Options, Outstanding, Ending Balance	597	383
Number of Options, Exercisable	312
Weighted-Average Exercise Price Outstanding, Beginning Balance	$ 6.85
Weighted-Average Exercise Price, Granted	4.34
Weighted-Average Exercise Price, Exercised
Weighted-Average Exercise Price, Cancelled/Forfeited	6.85
Weighted-Average Exercise Price Outstanding, Ending Balance	5.77	$ 6.85
Weighted-Average Exercise Price, Exercisable	$ 6.85
Weighted-Average Remaining Contractual Term, Outstanding	3 years 6 months	3 years 9 months 18 days
Weighted-Average Remaining Contractual Term, Exercisable	2 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding	$ 434
Aggregate Intrinsic Value, Exercisable

Stock-Based Compensation (Det_4

Stock-Based Compensation (Details Textual) $ / shares in Units, $ in Thousands	May 07, 2018USD ($)Item$ / sharesshares	May 05, 2015USD ($)	Aug. 31, 2018USD ($)shares	Aug. 31, 2017USD ($)Stockshares	Dec. 31, 2018USD ($)shares	Dec. 31, 2017USD ($)shares
Stock-Based Compensation (Textual)
Stock-based compensation					$ 4,523	$ 5,213
Class B common stock issued for GRE deferred stock units					$ 1,886	1,845
Option awards vest services contractual term					3 years
Option awards vest contractual term					10 years
Recognized compensation costs, description					GRES recognized compensation costs related to the vesting of the GRES deferred stock units of minimal amount and nil for the year ended December 31, 2018 and 2017, respectively.
GREI [Member]
Stock-Based Compensation (Textual)
Total unrecognized compensation cost					$ 100
Period of unrecognized compensation cost expected to be recognized					1 year 7 months 6 days
Ownership interest of company				4.00%
Vesting of deferred stock units					$ 100
GES [Member]
Stock-Based Compensation (Textual)
Period of unrecognized compensation cost expected to be recognized					1 year 7 months 6 days
Ownership interest of company				4.50%
GRES [Member]
Stock-Based Compensation (Textual)
Total unrecognized compensation cost					$ 100
Officers and employees [Member]
Stock-Based Compensation (Textual)
Ownership interest of company		3.90%
Restricted Stock [Member]
Stock-Based Compensation (Textual)
Option awards vest services contractual term					3 years
Restricted Stock Granted [Member]
Stock-Based Compensation (Textual)
Total grant date fair value of shares vested					$ 400	400
Stock-based compensation					$ 3,400	3,100
Stock options [Member]
Stock-Based Compensation (Textual)
Period of unrecognized compensation cost expected to be recognized					9 months 18 days
Other Subsidiary Equity [Member]
Stock-Based Compensation (Textual)
Stock-based compensation					$ 1,100	$ 2,100
Fair value of the deferred stock units grants		$ 3,300
Common Class B [Member]
Stock-Based Compensation (Textual)
Class B common stock issued for GRE deferred stock units, Shares | shares					310,000	287,000
Class B common stock issued for GRE deferred stock units					$ 3	$ 3
Class B common stock with aggregate cost			$ 800
Acquired shares | shares			128,865
Common Class B [Member] | GRE [Member]
Stock-Based Compensation (Textual)
Class B common stock issued for GRE deferred stock units, Shares | shares			310,467	287,233
Class B common stock issued for GRE deferred stock units			$ 1,900	$ 1,800
Class B common stock with aggregate cost				$ 800
Acquired shares | shares				129,898
Common Class B [Member] | Howard Jonas [Member]
Stock-Based Compensation (Textual)
Exercise price | $ / shares	$ 4.34
Cash bonus	$ 300
Acquired shares | shares	256,818
Number of annual installments in which options will vest | Item	5
Common Class B [Member] | Restricted Stock [Member]
Stock-Based Compensation (Textual)
Total unrecognized compensation cost					$ 1,700
Period of unrecognized compensation cost expected to be recognized					2 years 3 months 18 days
Deferred Stock [Member] | GRE [Member]
Stock-Based Compensation (Textual)
Vested deferred stock units of IDT Energy | Stock				26.1
2011 Stock Option and Incentive Plan [Member]
Stock-Based Compensation (Textual)
Shares available for future grants, Shares | shares					275,000
2011 Stock Option and Incentive Plan [Member] | Common Class B [Member]
Stock-Based Compensation (Textual)
Common stock reserved for future issuance | shares	974,199				2,300,000

Variable Interest Entity (Detai

Variable Interest Entity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Abstract]
Net income (loss)	$ (1,197)	$ 112
Aggregate funding repaid to (provided by) the Company, net	$ (809)	$ 158

Variable Interest Entity (Det_2

Variable Interest Entity (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Summarized consolidated balance sheet amounts related to CCE
TOTAL ASSETS	$ 1,463	$ 2,035
TOTAL LIABILITIES AND NONCONTROLLING INTERESTS	1,463	2,035
Cash and cash equivalents [Member]
Summarized consolidated balance sheet amounts related to CCE
TOTAL ASSETS	70	83
Trade accounts receivable [Member]
Summarized consolidated balance sheet amounts related to CCE
TOTAL ASSETS	623	1,031
Prepaid expenses [Member]
Summarized consolidated balance sheet amounts related to CCE
TOTAL ASSETS	377	451
Other current assets [Member]
Summarized consolidated balance sheet amounts related to CCE
TOTAL ASSETS	34	31
Other assets [Member]
Summarized consolidated balance sheet amounts related to CCE
TOTAL ASSETS	359	439
Current liabilities [Member]
Summarized consolidated balance sheet amounts related to CCE
TOTAL LIABILITIES AND NONCONTROLLING INTERESTS	513	698
Due to IDT Energy [Member]
Summarized consolidated balance sheet amounts related to CCE
TOTAL LIABILITIES AND NONCONTROLLING INTERESTS	1,949	1,140
Noncontrolling interests from CCE [Member]
Summarized consolidated balance sheet amounts related to CCE
TOTAL LIABILITIES AND NONCONTROLLING INTERESTS	$ (999)	$ 197

Variable Interest Entity (Det_3

Variable Interest Entity (Details Textual) - CCE [Member] $ in Millions	1 Months Ended
	Oct. 31, 2015USD ($)
Variable Interest Entity (Textual)
Payment to owner of limited liability company	$ 0.2
Loan amount	$ 0.5
Variable interest entity, description	GRE paid $0.2 million to the owner of the limited liability company interests in CCE, and loaned CCE $0.5 million in exchange for an option to purchase 100% of the issued and outstanding limited liability company interests of CCE for one dollar plus the forgiveness of the $0.5 million loan.
Percentage of option to purchase	100.00%
Forgiveness of loan	$ 0.5
Options expiration date	Oct. 22, 2023

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Summary of accumulated balances for other comprehensive income
Accumulated other comprehensive income, Foreign currency translation, Beginning balance	$ 3,045	$ 1,465
Other comprehensive income attributable to Genie, Foreign currency translation	(454)	1,580
Accumulated other comprehensive income, Foreign currency translation, Ending balance	$ 2,591	$ 3,045

Legal and Regulatory Proceedi_2

Legal and Regulatory Proceedings (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)Plaintiffs	Dec. 31, 2017USD ($)	Sep. 30, 2018USD ($)	Mar. 22, 2018USD ($)	Sep. 30, 2017USD ($)
Legal and Regulatory Proceedings (Textual)
Selling, general and administrative expense		$ 61,583	$ 80,122
Accrued expenses		25,242	28,069
Other current liabilities		$ 4,416	3,172
Number of plaintiffs | Plaintiffs		3
Settlement Agreement [Member]
Legal and Regulatory Proceedings (Textual)
Total settlement payment	$ 7,600	$ 3,400	9,000
Selling, general and administrative expense		1,700
Other current liabilities		2,300
Related revenue reduction		1,700
New Jersey Office and Attorney General [Member]
Legal and Regulatory Proceedings (Textual)
Total payments reasonable settlement					$ 1,200
Accrued expenses						$ 1,500
New York PSC [Member]
Legal and Regulatory Proceedings (Textual)
Gross revenue		$ 74,200	91,000
Percentage of GRE's total meters served		32.40%
Percentage of total RCEs of GRE's customer base		24.80%
IDT Energy [Member]
Legal and Regulatory Proceedings (Textual)
Total payments reasonable settlement					$ 1,400
Ohio Public Utilities Commission [Member]
Legal and Regulatory Proceedings (Textual)
Accrued expenses				$ 200
Gross revenue		$ 1,400	2,100
Stock Granted, Value, Share-based Compensation, Forfeited		$ 200
Percentage of GRE's total meters served		0.30%
Percentage of total RCEs of GRE's customer base		0.40%
State of Connecticut Public Utilities Regulatory Authority [Member]
Legal and Regulatory Proceedings (Textual)
Gross revenue		$ 24,800	20,800
Percentage of GRE's total meters served		8.20%
Percentage of total RCEs of GRE's customer base		9.50%
State of Illinois Office of Attorney General [Member]
Legal and Regulatory Proceedings (Textual)
Total payments reasonable settlement		$ 3,000
Other current liabilities				$ 3,000
Gross revenue		$ 16,500	$ 25,900
Percentage of GRE's total meters served		5.70%
Percentage of total RCEs of GRE's customer base		4.50%

Commitments and Contingencies_2

Commitments and Contingencies (Details) $ in Thousands	Dec. 31, 2018USD ($)
Purchase Commitments
2019	$ 68,088
2020	35,655
2021	3,551
2022	547
Total payments	$ 107,841

Commitments and Contingencies_3

Commitments and Contingencies (Details 1) $ in Thousands	Dec. 31, 2018USD ($)
Future minimum payments for operating leases
2019	$ 527
2020	428
2021	377
2022	217
2023	221
Thereafter	1,530
Total payments	$ 3,300

Commitments and Contingencies_4

Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies (Textual)
Purchase and other commitments	$ 107.8
Future purchases of electricity	90.1
Rental expense and operating leases	0.7	$ 0.8
Genie Retail Energy [Member]
Commitments and Contingencies (Textual)
Aggregate performance bond outstanding	12.5
Purchase of renewable energy credit	$ 17.7
BP [Member]
Commitments and Contingencies (Textual)
Agreement termination, Description	The agreement’s termination date is November 30, 2019
Payment of trade accounts payable to BP Energy	$ 14.4
Advance payment	2
Trade Accounts Receivable [Member]
Commitments and Contingencies (Textual)
Assets pledged as collateral to BP Energy	37.8
Restricted Cash [Member]
Commitments and Contingencies (Textual)
Assets pledged as collateral to BP Energy	$ 1.6

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
IDT [Member]
Summary of related party transactions
Amount charged to the Company	$ 1,340	$ 1,773
Amount charged by the Company	355	471
Rafael [Member]
Summary of related party transactions
Amount charged to the Company	$ 161

Related Party Transactions (D_2

Related Party Transactions (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
IDT [Member]
Related Party Transaction [Line Items]
Due to Related Parties	$ 267	$ 1,773
Due from Related Parties	33	471
Rafael [Member]
Related Party Transaction [Line Items]
Due to Related Parties

Related Party Transactions (D_3

Related Party Transactions (Details Textual) - USD ($) $ in Thousands	Aug. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Related Party Transactions (Textual)
Notes receivable outstanding from employees		$ 200	$ 600
Net book value	$ 1,000		108
Amount paid to employees		800
Recognized gain from extinguishment of liability		200
Aggregate principal amount	400			$ 500
Outstanding balance	500
Accrued interest	$ 100
New note payment terms, description	The New Note requires scheduled payments starting on December 31, 2020 until December 31, 2052.
Payment of insurance premium		300	$ 200
New Note Member
Related Party Transactions (Textual)
Outstanding balance	$ 100	$ 100

Business Segment and Geograph_3

Business Segment and Geographic Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating results for the business segments
Revenues	$ 280,309	$ 264,202
Income (loss) from operations	11,978	(5,975)
Depreciation and amortization	2,062	2,140
Exploration	244	4,879
Impairment of assets	2,742
Write-off of capitalized exploration costs		6,483
Equity in the net loss of equity method investees	(3,430)	(565)
GRE [Member]
Operating results for the business segments
Revenues	274,443	262,318
Income (loss) from operations	27,787	17,371
Depreciation and amortization	1,538	1,718
Exploration
Impairment of assets
Write-off of capitalized exploration costs
Equity in the net loss of equity method investees	(2,990)	565
GES [Member]
Operating results for the business segments
Revenues	5,696	1,884
Income (loss) from operations	(982)	(785)
Depreciation and amortization	178	22
Exploration
Impairment of assets
Write-off of capitalized exploration costs
Equity in the net loss of equity method investees
GOGAS [Member]
Operating results for the business segments
Revenues	170
Income (loss) from operations	(6,532)	(13,291)
Depreciation and amortization	345	399
Exploration	244	4,879
Impairment of assets	2,742
Write-off of capitalized exploration costs		6,483
Equity in the net loss of equity method investees	(440)
Corporate [Member]
Operating results for the business segments
Revenues
Income (loss) from operations	(8,295)	(9,835)
Depreciation and amortization	1	1
Exploration
Impairment of assets
Write-off of capitalized exploration costs
Equity in the net loss of equity method investees

Business Segment and Geograph_4

Business Segment and Geographic Information (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Summary total assets for the business segments
Total assets:	$ 146,864	$ 125,778
GRE [Member]
Summary total assets for the business segments
Total assets:	117,572	110,450
GES [Member]
Summary total assets for the business segments
Total assets:	11,519	2,071
GOGAS [Member]
Summary total assets for the business segments
Total assets:	15,375	10,475
Corporate [Member]
Summary total assets for the business segments
Total assets:	$ 2,398	$ 2,782

Business Segment and Geograph_5

Business Segment and Geographic Information (Details 2) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Net Long Lived Assets and Assets Held Outside Country [Abstract]
Long-lived assets, net	$ 21,938	$ 4,048
Total assets	146,864	125,778
United States [Member]
Net Long Lived Assets and Assets Held Outside Country [Abstract]
Long-lived assets, net	20,529	696
Total assets	141,336	115,605
Foreign Countries [Member]
Net Long Lived Assets and Assets Held Outside Country [Abstract]
Long-lived assets, net	1,409	3,352
Total assets	$ 5,528	$ 10,173

Business Segment and Geograph_6

Business Segment and Geographic Information (Details Textual)	12 Months Ended
	Dec. 31, 2018Segment
Business Segment and Geographic Information (Textual)
Company's investment, ownership percentage in subsidiary	100.00%
Number of reportable segments	3
GEIC [Member]
Business Segment and Geographic Information (Textual)
Company's investment, ownership percentage in subsidiary	99.30%
GRE [Member]
Business Segment and Geographic Information (Textual)
Company's investment, ownership percentage in subsidiary	100.00%
GOGAS [Member]
Business Segment and Geographic Information (Textual)
Company's investment, ownership percentage in subsidiary	92.00%
Afek [Member]
Business Segment and Geographic Information (Textual)
Company's investment, ownership percentage in subsidiary	86.10%

Subsequent Event (Details)

Subsequent Event (Details)	Jan. 02, 2019	Oct. 25, 2018
Subsequent Event (Textual)
Purchase controlling interest		60.00%
Subsequent Event [Member] | Acquisition Lumo [Member]
Subsequent Event (Textual)
Purchase controlling interest	80.00%