Note 9 - Property, Plant and Equipment and Construction-in-process - Significant Unobservable Inputs (Details) - North Brawley Geothermal Power Plant [Member]	Dec. 31, 2022 USD ($)
Average generation capacity (MW)	7
Electricity price escalation (%)	2.20%
Cost long-term growth rate	2.2
Average realized electricity price ($/MW)	$ 92.2