Note 1 - General and Basis of Presentation - Fair Value of Amounts of Identified Assets and Liabilities Assumed in a Business Combination (Details) - USD ($) $ in Thousands		Mar. 31, 2024	Jan. 04, 2024	Dec. 31, 2023
Goodwill		$ 151,122		$ 90,544
Purchase Agreement With Enel Green Power North America [Member]
Trade receivables and others (1)	[1]		$ 4,400
Deferred income taxes			3,100
Property, plant and equipment and construction-in-process (2)	[2]		197,700
Operating lease right of use			1,200
Other long-term assets			200
Intangible assets (3)	[3]		23,600
Goodwill	[4]		60,700
Total assets acquired			290,900
Accounts payable, accrued expenses and others			1,500
Other current liabilities			1,800
Operating lease liabilities			1,200
Other long-term liabilities			5,000
Asset retirement obligation			6,800
Total liabilities assumed			16,300
Total assets acquired, and liabilities assumed, net			$ 274,600

[1] The gross amount of trade receivables was fully collected subsequent to acquisition date.

[2] The fair value of Property, Plant and equipment was estimated by applying the income approach and utilizing the discounted cash flow method. This methodology assesses the value of tangible assets by computing the anticipated cash flows expected to be generated by the respective assets.

[3] Intangible assets are related to the long-term electricity PPAs described above and are amortized over the term of those PPAs. The fair value of the intangible assets was estimated by applying the income approach and utilizing the Comparative Method of discounted cash flow.

[4] Goodwill is primarily related to the expected synergies, potential cost savings in operations as a result of the purchase transaction as well as potential future development of the greenfield assets. The goodwill is allocated to the Electricity segment and is deductible for tax purposes.