Note 9 - Property, Plant and Equipment and Construction-in-process - Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, plant and equipment	$ 3,843,005	$ 3,494,589
Asset retirement cost	41,157	28,946
Less accumulated depreciation	(1,548,032)	(1,395,543)
Property, plant and equipment, net	2,294,973	2,099,046
Land [Member]
Property, plant and equipment	40,545	40,157
Leasehold Improvements [Member]
Property, plant and equipment	9,105	8,477
Machinery and Equipment [Member]
Property, plant and equipment	302,367	271,981
Office Equipment [Member]
Property, plant and equipment	48,275	43,555
Vehicles [Member]
Property, plant and equipment	10,724	8,960
Energy Equipment [Member]
Property, plant and equipment	79,805	63,562
Geothermal And Recovered Energy Generation Power Plants [Member] \| UNITED STATES
Property, plant and equipment	2,511,027	2,296,414
Geothermal And Recovered Energy Generation Power Plants [Member] \| Foreign Countries [Member]
Property, plant and equipment	$ 800,000	$ 732,537

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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