Note 14 - Variable Interest Entity (Details Textual) - USD ($) $ in Thousands		6 Months Ended
Apr. 24, 2024	Jun. 30, 2025	Jun. 30, 2024
Payments to Acquire Interest in Subsidiaries and Affiliates		$ (0)	$ 1,200
Variable Interest Entity, Primary Beneficiary [Member] \| Genie Retail Energy (“GRE”) [Member]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	100.00%
Payments to Acquire Interest in Subsidiaries and Affiliates	$ 1,000

The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-13

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration