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Commitments and Contingencies (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Commitments and Contingencies (Textual) |  |  |
Line of credit facility, amount outstanding | $ 7.7 | $ 7.6 |
Purchase and other commitments | $ 22.4 |  |
Line of credit facility expiration, Description | The Company had letters of credit outstanding totaling $7.7 million primarily for the benefit of regional transmission organizations that coordinate the movement of wholesale electricity and for certain utility companies. The letters of credit outstanding at December 31, 2015 expire as follows: $4.2 million in the year ending December 31, 2016 and $3.5 million in the year ending December 31, 2017. |  |
Letters of credit outstanding amount due in September 30, 2016 | $ 4.2 |  |
Letters of credit outstanding amount due in September 30, 2017 | 3.5 |  |
Rental expense and operating leases | $ 1.2 | $ 0.8 | $ 0.6
Purchase commitment description | The Company had purchase commitments of $22.4 million at December 31, 2015. The purchase commitments outstanding at December 31, 2015 are expected to be paid as follows: $14.7 million in the year ending December 31, 2016, $6.6 million in the year ending December 31, 2017 and $1.1 million in the year ending December 31, 2018. |  |
Purchase commitment due in December 31, 2016 | $ 14.7 |  |
Purchase commitment due in December 31, 2017 | 6.6 |  |
Purchase commitment due in December 31, 2018 | 1.1 |  |
Genie Retail Energy [Member] |  |  |
Commitments and Contingencies (Textual) |  |  |
Aggregate performance bond outstanding | 11.9 |  |
Purchase of renewable energy credit | 41.8 |  |
Afek Oil and Gas Ltd [Member] |  |  |
Commitments and Contingencies (Textual) |  |  |
Environmental remediation liability | 0.2 |  |
BP [Member] |  |  |
Commitments and Contingencies (Textual) |  |  |
Payment of trade accounts payable to BP Energy | $ 8.3 |  |
Agreement termination, Description | The agreement's termination date is November 30, 2019, except either party may terminate the agreement on November 30, 2018 by giving the other party notice by May 31, 2018. |  |
Trade Accounts Receivable [Member] |  |  |
Commitments and Contingencies (Textual) |  |  |
Assets pledged as collateral to BP Energy | $ 27.0 |  |
Restricted Cash [Member] |  |  |
Commitments and Contingencies (Textual) |  |  |
Assets pledged as collateral to BP Energy | $ 0.8 |  |

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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of all assets that are pledged as collateral for the payment of the related debt obligation primarily arising from secured borrowings, repurchase agreements or other current or potential obligations, where the secured party does not have the right by contract or custom to sell or re-pledge the collateral and therefore are not reclassified and separately reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=55761124&loc=SL6224234-111729 + Details
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- Definition Excluding long-term commitments, description of arrangements in which the entity has agreed to expend funds to procure goods or services from one or more suppliers, which may include identification of the goods or services to be purchased, identity of the seller, pricing, effects on pricing (such as penalties) of failing to reach minimum quantities required to be purchased, cancellation rights, and termination provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.17) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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