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Note 8 - Property, Plant and Equipment and Construction-in-process (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Depreciation, Total | $ 98.8 | $ 94.8 | $ 95.2
Depreciation Net Of Amortization Of Cash Grant | 5.5 | 5.5 | $ 5.5
Property, Plant and Equipment Including Construction In Progress, Net | 1,447.4 | 1,376.1 |
Property, Plant and Equipment, Cash Grant, Net | 133.2 | 138.7 |
Geotermica Platanares [Member] |  |  |
Property, Plant and Equipment Including Construction In Progress, Net | $ 140.3 | 67.5 |
Power Plant Usage Agreement Term | 15 years |  |
Geothermie Bouillante SA (“GB”) [Member] |  |  |
Property, Plant and Equipment Including Construction In Progress, Net | $ 24.9 | 20.3 |
Orzunil I de Electricidad, Limitada [Member] |  |  |
Property, Plant and Equipment Including Construction In Progress, Net | 9.9 | 12.2 |
Ortitlan Limitada [Member] |  |  |
Property, Plant and Equipment Including Construction In Progress, Net | $ 40.7 | $ 40.3 |
Kenya Power and Lighting Co Limited [Member] |  |  |
Power Purchase Agreements Term | 20 years |  |
Zunil Power Plant In Guatemala [Member] | Instituto Nacional de Electrificacion (INDE) [Member] |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 3.00% |
ENEE [Member] | Geotermica Platanares [Member] |  |  |
Power Purchase Agreements Term | 30 years |  |
EDF [Member] | Geothermie Bouillante SA (“GB”) [Member] |  |  |
Power Purchase Agreements Term | 15 years |  |
Foreign Countries [Member] |  |  |
Property, Plant and Equipment Including Construction In Progress, Net | $ 580.8 | $ 487.0 |
KENYA | Power Plants [Member] |  |  |
Property, Plant and Equipment Including Construction In Progress, Net | $ 326.1 | $ 315.0 |

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