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Basis of Presentation (Details)
 3 Months Ended 6 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Basis of Presentation (Textual)            
Company's investment, ownership percentage in subsidiary         86.10%  
Ownership interest of company         77.00%  
Genie Retail Energy [Member]            
Basis of Presentation (Textual)            
Company's investment, ownership percentage in subsidiary         100.00%  
Percentage of gas revenue generated in given period 31.80% 46.90%   50.30%    
Percentage of electricity revenue generated in given period     29.50%      
Genie Oil and Gas, Inc. [Member]            
Basis of Presentation (Textual)            
Company's investment, ownership percentage in subsidiary         97.00%  
Genie Energy Services [Member]            
Basis of Presentation (Textual)            
Company's investment, ownership percentage in subsidiary         100.00%  
Prism Solar Technology [Member]            
Basis of Presentation (Textual)            
Business Acquired interest         60.00%  
Afek Oil and Gas, Ltd. [Member]            
Basis of Presentation (Textual)            
Company's investment, ownership percentage in subsidiary         86.10%  
Lumo Energia Oyj [Member]            
Basis of Presentation (Textual)            
Company's investment, ownership percentage in subsidiary         100.00%  
Business Acquired interest           92.50%
GRE International Corporation [Member]            
Basis of Presentation (Textual)            
Company's investment, ownership percentage in subsidiary         99.30%  
Genie Retail Energy International [Member]            
Basis of Presentation (Textual)            
Company's investment, ownership percentage in subsidiary         100.00%  
Atid Drilling Ltd. [Member]            
Basis of Presentation (Textual)            
Company's investment, ownership percentage in subsidiary         37.50%