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Note 8 - Business Segments (Details Textual) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Number of Reportable Segments	3
Revenue from Contract with Customer, Including Assessed Tax	$ 224,166	$ 185,232
Goodwill	151,122		$ 90,544
Electricity Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	191,253	170,310
Goodwill	146,500	85,800
Electricity Segment [Member] | Accounted for Under ASC 606 [Member]
Revenue from Contract with Customer, Including Assessed Tax	44,800	32,700
Energy Storage and Management Services [Member]
Goodwill	4,600	4,600
Energy Storage and Management Services [Member] | Accounted for Under Lease Accounting [Member]
Revenue from Contract with Customer, Including Assessed Tax	700	0
Product Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	24,832	10,042
Goodwill	$ 0	$ 0

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