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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