Note 1 - General and Basis of Presentation - Summary of Pro Forma Information Related to a Business Combination (Details) - Purchase Agreement With Enel Green Power North America [Member] - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Business Acquisition, Pro Forma Revenue	$ 224.2	$ 194.7
Net income attributable to the Company's stockholders	39.9	27.7
Electricity Segment [Member]
Business Acquisition, Pro Forma Revenue	$ 191.3	$ 179.8