Note 4 - Revenue Recognition - Schedule of Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues	$ 105,251	$ 90,696	$ 242,058	$ 210,384
Sales Channel, Directly to Consumer [Member]
Revenues	80,739	78,389	190,996	178,252
Sales Channel, Through Intermediary [Member]
Revenues	18,253	8,326	40,468	20,257
Sales Channel, Other [Member]
Revenues	6,259	3,981	10,594	11,875
Electricity [Member]
Revenues	89,885	78,301	193,948	167,697
Electricity [Member] | Sales Channel, Directly to Consumer [Member]
Revenues	74,251	72,759	161,134	155,701
Electricity [Member] | Sales Channel, Through Intermediary [Member]
Revenues	15,634	5,542	32,814	11,996
Electricity [Member] | Sales Channel, Other [Member]
Revenues	0	0	0	0
Oil and Gas [Member]
Revenues	9,107	8,414	37,516	30,812
Oil and Gas [Member] | Sales Channel, Directly to Consumer [Member]
Revenues	6,488	5,630	29,862	22,551
Oil and Gas [Member] | Sales Channel, Through Intermediary [Member]
Revenues	2,619	2,784	7,654	8,261
Oil and Gas [Member] | Sales Channel, Other [Member]
Revenues	0	0	0	0
Product and Service, Other [Member]
Revenues	6,259	3,981	10,594	11,875
Product and Service, Other [Member] | Sales Channel, Directly to Consumer [Member]
Revenues	0	0	0	0
Product and Service, Other [Member] | Sales Channel, Through Intermediary [Member]
Revenues	0	0	0	0
Product and Service, Other [Member] | Sales Channel, Other [Member]
Revenues	6,259	3,981	10,594	11,875
Fixed-Price Contract [Member]
Revenues	58,053	50,502	123,887	110,027
Fixed-Price Contract [Member] | Electricity [Member]
Revenues	55,400	47,207	114,304	99,303
Fixed-Price Contract [Member] | Oil and Gas [Member]
Revenues	2,653	3,295	9,583	10,724
Fixed-Price Contract [Member] | Product and Service, Other [Member]
Revenues	0	0	0	0
Time-and-Materials Contract [Member]
Revenues	40,939	36,213	107,577	88,482
Time-and-Materials Contract [Member] | Electricity [Member]
Revenues	34,485	31,094	79,644	68,394
Time-and-Materials Contract [Member] | Oil and Gas [Member]
Revenues	6,454	5,119	27,933	20,088
Time-and-Materials Contract [Member] | Product and Service, Other [Member]
Revenues	0	0	0	0
Other Basis of Pricing Contract [Member]
Revenues	6,259	3,981	10,594	11,875
Other Basis of Pricing Contract [Member] | Electricity [Member]
Revenues	0	0	0	0
Other Basis of Pricing Contract [Member] | Oil and Gas [Member]
Revenues	0	0	0	0
Other Basis of Pricing Contract [Member] | Product and Service, Other [Member]
Revenues	$ 6,259	$ 3,981	$ 10,594	$ 11,875