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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
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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

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