Note 5 - Acquisitions and Discontinued Operations - Schedule of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Current assets of discontinued operations	$ 1,423		$ 1,423		$ 3,594
Noncurrent assets of discontinued operations	5,537		5,537		4,466
Current liabilities of discontinued operations	3,740		3,740		4,585
Noncurrent liabilities of discontinued operations	744		744		705
Net loss from discontinued operations, net of tax	47	$ (145)	(57)	$ (410)
Lumo Sweden [Member] | Discontinued Operations, Disposed of by Sale [Member]
Cash	1,000		1,000		1,314
Receivables from the settlement of derivative contract—current	0		0		2,280
Other current assets	423		423		0
Current assets of discontinued operations	1,423		1,423		3,594
Other noncurrent assets	5,537		5,537		3,240
Noncurrent assets of discontinued operations	5,537		5,537		3,240
Income taxes payable	789		789		734
Accounts payable and other current liabilities	2,951		2,951		2,644
Current liabilities of discontinued operations	3,740		3,740		3,378
Deferred tax liabilities	744		744		665
Noncurrent liabilities of discontinued operations	744		744		$ 665
Net loss from discontinued operations, net of tax	47	(145)	(57)	(410)
Income (loss) before income taxes attributable to Genie Energy Ltd.	$ 58	$ (60)	$ (50)	$ (503)