Note 18 - Business Segment Information - Schedule of Total Assets Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Total assets	$ 383,092	$ 371,275
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Total assets	130,103	128,503
Genie Retail Energy (“GRE”) [Member] | Operating Segments [Member]
Total assets	209,600	204,470
Genie Renewables (GREW) [Member] | Operating Segments [Member]
Total assets	$ 43,389	$ 38,302