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Basis of Presentation and Business Changes and Development (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2021
Basis of Presentation and Business Changes and Development (Textual)
Percentage of gas revenue generated in given period	39.70%	44.50%	30.50%	30.30%
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%
Prism Solar Technology [Member]
Basis of Presentation and Business Changes and Development (Textual)
Business acquired interest	60.00%
GRE 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%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(d))
-URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227

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