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Restatement of Unaudited Consolidated Financial Statements and Additional Disclosure (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Electricity revenues $ 52,966 $ 45,126  
Cost of revenues 46,556 34,832  
Gross profit 24,849 24,047  
Provision for income taxes 856 1,096  
Net income 4,139 4,850  
Net income attributable to Genie Energy, Ltd 4,582 5,669  
Comprehensive income 4,581 6,107  
Comprehensive income attributable to Genie Energy, Ltd $ 5,282 $ 6,929  
Earnings per share attributable to Genie Energy, Ltd. common stockholders:      
Basic $ 0.18 $ 0.23  
Diluted $ 0.18 $ 0.22  
Consolidated Balance Sheet:      
Trade accounts receivable, net $ 35,202   $ 36,858
Prepaid expenses 3,988   4,026
Total assets 124,393   121,813
Income taxes payable 3,299   2,426
Total liabilities 41,646   41,948
Accumulated deficit (49,205)   (51,567)
Total liabilities and equity 124,393   $ 121,813
Error Correction [Member]      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Electricity revenues 492    
Natural gas revenues 1,473    
Cost of revenues 737    
Gross profit 1,228    
Provision for income taxes 123    
Net income 1,105    
Net income attributable to Genie Energy, Ltd 1,105    
Comprehensive income 1,105    
Comprehensive income attributable to Genie Energy, Ltd $ 1,105    
Earnings per share attributable to Genie Energy, Ltd. common stockholders:      
Basic $ 0.05    
Diluted $ 0.05    
Consolidated Balance Sheet:      
Trade accounts receivable, net $ 1,817    
Prepaid expenses (589)    
Total assets 1,228    
Income taxes payable 123    
Total liabilities 123    
Accumulated deficit 1,105    
Total liabilities and equity 1,228    
Previously Reported [Member]      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Electricity revenues 52,474 $ 44,385  
Natural gas revenues 16,467    
Cost of revenues 45,819 33,274  
Gross profit 23,621 24,864  
Provision for income taxes 733    
Net income 3,034 5,667  
Net income attributable to Genie Energy, Ltd 3,477 6,486  
Comprehensive income 3,476 6,924  
Comprehensive income attributable to Genie Energy, Ltd $ 4,177 $ 7,746  
Earnings per share attributable to Genie Energy, Ltd. common stockholders:      
Basic $ 0.13 $ 0.27  
Diluted $ 0.13 $ 0.26  
Consolidated Balance Sheet:      
Trade accounts receivable, net $ 33,385    
Prepaid expenses 4,577    
Total assets 123,165    
Income taxes payable 3,176    
Total liabilities 41,523    
Accumulated deficit (50,310)    
Total liabilities and equity 123,165    
Restated [Member]      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Electricity revenues 52,966    
Natural gas revenues 17,940    
Cost of revenues 46,556    
Gross profit 24,849    
Provision for income taxes 856    
Net income 4,139    
Net income attributable to Genie Energy, Ltd 4,582    
Comprehensive income 4,581    
Comprehensive income attributable to Genie Energy, Ltd $ 5,282    
Earnings per share attributable to Genie Energy, Ltd. common stockholders:      
Basic $ 0.18    
Diluted $ 0.18    
Consolidated Balance Sheet:      
Trade accounts receivable, net $ 35,202    
Prepaid expenses 3,988    
Total assets 124,393    
Income taxes payable 3,299    
Total liabilities 41,646    
Accumulated deficit (49,205)    
Total liabilities and equity $ 124,393