v3.26.1
Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Apr. 27, 2026
Jun. 30, 2025
Document Information [Line Items]      
Entity Central Index Key 0001528356    
Entity Registrant Name Genie Energy Ltd.    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 1-35327    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 45-2069276    
Entity Address, Address Line One 520 Broad Street    
Entity Address, City or Town Newark    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07102    
City Area Code 973    
Local Phone Number 438-3500    
Title of 12(b) Security Class B common stock, par value $0.01 per share    
Trading Symbol GNE    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] true    
Document Financial Statement Restatement Recovery Analysis [Flag] true    
Entity Shell Company false    
Entity Public Float     $ 512,400,000
Auditor Name CBIZ CPAs, P.C    
Auditor Location New York, NY    
Auditor Firm ID 199    
Common Class A [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   1,574,326  
Common Class B [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   24,826,192