Note 18 - Business Segment Information (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Number of Reportable Segments			2
Revenue from Contract with Customer, Excluding Assessed Tax	$ 105,251	$ 90,696	$ 242,058	$ 210,384
Cost of Revenue	81,771	57,360	181,215	143,262
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]
Revenue from Contract with Customer, Excluding Assessed Tax	0	0	0	0
Cost of Revenue	0	$ 0	0	$ 0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Lumo Energia Oyj ("Lumo Finland") and Lumo Energi AB ("Lumo Sweden") [Member]
Disposal Group, Including Discontinued Operation, Assets	$ 7,000		$ 7,000		$ 6,800