Note 5 - Acquisitions and Discontinued Operations (Details Textual) $ in Thousands, € in Millions					1 Months Ended		3 Months Ended		6 Months Ended		13 Months Ended	16 Months Ended	20 Months Ended
	May 27, 2024 EUR (€)	Nov. 09, 2023 EUR (€)	Nov. 08, 2023 EUR (€)	Nov. 03, 2023 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 EUR (€)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Apr. 12, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 EUR (€)	Jun. 30, 2025 USD ($)	Feb. 28, 2024 USD ($)
Loss Contingency, Loss in Period							$ 2,600	€ 2.5
Claim Against Derivative Instrument Gain [Member]
Gain (Loss) on Sale of Derivatives			€ 35.2												$ 41,500
Loss Contingency, Damages Sought, Value	€ 4.8										$ 5,700		$ 47,200	€ 40.0
Recovery of Payments [Member]
Loss Contingency, Damages Sought, Value			€ 4.2												$ 5,000
Recovery of Payments [Member] | Guarantee Obligations [Member]
Loss Contingency, Damages Sought, Value		€ 1.6											$ 1,900
Minimum [Member]
Loss Contingency, Estimate of Possible Loss | €								2.0
Maximum [Member]
Loss Contingency, Estimate of Possible Loss | €								€ 4.0
Solar System Facilities [Member]
Payments to Acquire Property, Plant, and Equipment									$ (0)	$ 1,344
Acquisition of Solar System Facilities [Member] | Solar System Facilities [Member]
Number of Real Estate Properties				10
Payments to Acquire Property, Plant, and Equipment				$ 7,500
Escrow Deposit Disbursements Related to Property Acquisition					$ 1,000
Asset Acquisition, Consideration Transferred				7,700
Asset Acquisition, Consideration Transferred, Transaction Cost				200
Acquisition of Solar System Facilities [Member] | Solar System Facilities [Member] | INDIANA
Payments to Acquire Property, Plant, and Equipment				$ 1,300
Property, Plant and Equipment, Useful Life (Year)																30 years
Property, Plant and Equipment, Gross																$ 1,300
Acquisition of Solar System Facilities [Member] | Solar System Facilities [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)				14 years
Acquisition of Solar System Facilities [Member] | Solar System Facilities [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)				30 years
Roded for New Israel Shekel (NIS) [Member]
Business Combination, Voting Equity Interest Acquired, Percentage						45.00%
Net Assets						$ 5,000
Business Combination, Consideration Transferred						1,500
Payments to Acquire Businesses, Gross												$ 400
Business Combination, Achieved in Stages, Preacquisition and Acquired Equity Interests in Acquiree, Percentage												51.20%
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Fair Value						$ 1,300