XML 12 R1.htm IDEA: XBRL DOCUMENT v3.10.0.1
Document and Entity Information - shares
 9 Months Ended
Sep. 30, 2018
Nov. 07, 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-Q  
Document Period End Date Sep. 30, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Ex Transition Period false  
Class A common stock    
Entity Common Stock, Shares Outstanding   1,574,326
Class B common stock    
Entity Common Stock, Shares Outstanding   25,296,325