v3.26.1
Note 1 - Basis of Presentation and Business Changes and Development (Details Textual)
3 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Jun. 30, 2026
Dec. 31, 2025
Product Concentration Risk [Member] | Revenue Benchmark [Member] | Oil and Gas [Member]            
Concentration Risk, Percentage 30.70% 43.30% 28.70% 43.00%    
Genie Retail Energy (“GRE”) [Member]            
Subsidiary, Ownership Percentage, Parent         100.00%  
Diversegy [Member] | Genie Renewables (GREW) [Member]            
Subsidiary, Ownership Percentage, Parent         91.50%  
Genie Solar [Member] | Genie Renewables (GREW) [Member]            
Subsidiary, Ownership Percentage, Parent         95.50%  
CityCom Solar [Member] | Genie Renewables (GREW) [Member]            
Subsidiary, Ownership Percentage, Parent         93.80%  
Roded Recycling Industries Ltd. [Member]            
Subsidiary, Ownership Percentage, Parent           71.00%
Roded Recycling Industries Ltd. [Member] | Genie Renewables (GREW) [Member]            
Subsidiary, Ownership Percentage, Parent         72.20%  
Able Minds ABA LLC [Member] | Genie Renewables (GREW) [Member]            
Subsidiary, Ownership Percentage, Parent         57.00%