Note 4 - Revenue Recognition - Schedule of Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenues	$ 100,399	$ 105,251	$ 242,711	$ 242,058
Sales Channel, Directly to Consumer [Member]
Revenues	86,596	80,739	211,317	190,996
Sales Channel, Through Intermediary [Member]
Revenues	7,535	18,253	17,577	40,468
Sales Channel, Other [Member]
Revenues	6,268	6,259	13,817	10,594
Electricity [Member]
Revenues	83,550	89,885	182,962	193,948
Electricity [Member] \| Sales Channel, Directly to Consumer [Member]
Revenues	78,925	74,251	172,698	161,134
Electricity [Member] \| Sales Channel, Through Intermediary [Member]
Revenues	4,625	15,634	10,264	32,814
Electricity [Member] \| Sales Channel, Other [Member]
Revenues	0	0	0	0
Oil and Gas [Member]
Revenues	10,581	9,107	45,932	37,516
Oil and Gas [Member] \| Sales Channel, Directly to Consumer [Member]
Revenues	7,671	6,488	38,619	29,862
Oil and Gas [Member] \| Sales Channel, Through Intermediary [Member]
Revenues	2,910	2,619	7,313	7,654
Oil and Gas [Member] \| Sales Channel, Other [Member]
Revenues	0	0	0	0
Product and Service, Other [Member]
Revenues	6,268	6,259	13,817	10,594
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	6,268	6,259	13,817	10,594
Fixed-Price Contract [Member]
Revenues	48,320	58,053	100,729	123,887
Fixed-Price Contract [Member] \| Electricity [Member]
Revenues	45,507	55,400	93,153	114,304
Fixed-Price Contract [Member] \| Oil and Gas [Member]
Revenues	2,813	2,653	7,576	9,583
Fixed-Price Contract [Member] \| Product and Service, Other [Member]
Revenues	0	0	0	0
Time-and-Materials Contract [Member]
Revenues	45,811	40,939	128,165	107,577
Time-and-Materials Contract [Member] \| Electricity [Member]
Revenues	38,043	34,485	89,809	79,644
Time-and-Materials Contract [Member] \| Oil and Gas [Member]
Revenues	7,768	6,454	38,356	27,933
Time-and-Materials Contract [Member] \| Product and Service, Other [Member]
Revenues	0	0	0	0
Other Basis of Pricing Contract [Member]
Revenues	6,268	6,259	13,817	10,594
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	$ 6,268	$ 6,259	$ 13,817	$ 10,594