Basis of Presentation and Business Changes and Development (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2023
Basis of Presentation and Business Changes and Development (Textual)
Interest rate					100.00%
Other nonoperating income					$ 3.1
Genie Retail Energy [Member]
Basis of Presentation and Business Changes and Development (Textual)
Company's investment, ownership percentage in subsidiary					100.00%
Percentage of gas revenue generated in given period	30.50%	39.70%	30.30%	44.50%
Prism Solar Technology [Member]
Basis of Presentation and Business Changes and Development (Textual)
Business acquired interest					60.00%
Genie Energy International Corporation [Member]
Basis of Presentation and Business Changes and Development (Textual)
Company's investment, ownership percentage in subsidiary					99.50%
Genie Retail Energy International [Member]
Basis of Presentation and Business Changes and Development (Textual)
Company's investment, ownership percentage in subsidiary					100.00%
CityCom Solar [Member]
Basis of Presentation and Business Changes and Development (Textual)
Company's investment, ownership percentage in subsidiary					92.80%
Genie Solar Energy [Member]
Basis of Presentation and Business Changes and Development (Textual)
Company's investment, ownership percentage in subsidiary					95.50%
Diversegy [Member]
Basis of Presentation and Business Changes and Development (Textual)
Company's investment, ownership percentage in subsidiary					96.00%