Note 2 - Business Acquisitions and Others	12 Months Ended
Dec. 31, 2017
Notes to Financial Statements
Business Combination Disclosure [Text Block]	NOTE 2 —BUSINESS ACQUISITIONS AND OTHERS ORIX transaction On July 26, 2017, the Company announced that ORIX Corporation (“ORIX”) closed its acquisition of approximately 11 million shares of the Company ’s common stock, representing an approximately 22% ownership stake in the Company, from FIMI ENRG Limited Partnership, FIMI ENRG, L.P., Bronicki Investments, Ltd. and certain senior members of the Company’s management team pursuant to a stock purchase agreement entered into by ORIX and the selling stockholders on May 4, 2017. In connection with the acquisition, on May 4, 2017, the Company entered into certain related agreements with ORIX, including a Governance Agreement, a Commercial Cooperation Agreement and a Registration Rights Agreement, following the unanimous recommendation of a special committee of the Board that was formed to evaluate and negotiate the stockholder arrangements proposed by ORIX, and following approval by the full Board. The closing of the transactions contemplated by the related agreements between ORIX and the Company also occurred on July 26, 2017. Under the Governance Agreement, ORIX has the right to designate three persons to the Board, which was expanded to nine directors, and also propose a fourth person to be mutually agreed by the Company and ORIX to serve as a new independent director on the Board. In addition, for so long as ORIX is entitled to board representation pursuant to the Governance Agreement, ORIX will be subject to certain customary standstill restrictions, including an effective 25% cap on its voting rights. Pursuant to the Registration Rights Agreement, ORIX also has certain customary registration rights with respect to the shares of the Company ’s common stock that it owns. Under the Commercial Cooperation Agreement, the Company has exclusive rights to develop, own, operate and provide equipment for ORIX geothermal energy projects in all markets outside of Japan. In addition, the Company has certain rights to serve as technical partner and co-invest in ORIX geothermal energy projects in Japan. ORIX will also assist the Company in obtaining project financing for its geothermal energy projects from a variety of leading providers of renewable energy debt financing with which ORIX has relationships in Asia and around the world. Viridity transaction On March 15, 2017, the Company completed the acquisition of substantially all of the business and assets of Viridity Energy, Inc., a privately held Philadelphia-based company formerly engaged in the provision of demand response, energy management and energy storage services. At closing, Viridity Energy Solutions Inc. (“Viridity”), a wholly owned subsidiary of the Company, paid initial consideration of $35.3 million. Additional contingent consideration with an estimated fair value of $12.4 million may be payable upon the achievement of certain performance milestones to be measured at the end of fiscal years 2017 and 2020. The first performance milestone measured at the end of 2017 was not achieved and as a result, the Company reversed the related liability in the amount of $0.6 million which was recorded under general and administrative expenses. Additionally, as of December 31, 2017, the contingent consideration amounted to $10.3 million. Using proprietary software and solutions, Viridity serves primarily retail energy providers, utilities, and large commercial and industrial customers. Viridity ’s offerings enable its customers to optimize and monetize their energy management, demand response and storage facilities potential by interacting on their behalf with regional transmission organizations and independent system operators. The Company accounted for the transaction in accordance with Accounting Standard Codification 805, Business Combinations, and consequently recorded intangible assets of $34.7 million primarily relating to Viridity ’s storage activities with a weighted-average amortization period of 19 years, approximately $0.4 million of working capital and fixed assets and $13.4 million of goodwill. Following the transaction, the Company consolidated Viridity in accordance with Accounting Standard Codification 810, Consolidation. The acquisition enabled the Company to enter the growing energy storage and demand response markets and expand its market presence. The revenues of Viridity for the period from March 15, 2017 to December 31, 2017 were included in the Company’s consolidated statements of operations and comprehensive income for the year ended December 31, 2017. Guadeloupe power plant transaction In July 2016, the Company closed its acquisition of Geothermie Bouillante SA (“ GB”). GB owns and operates the 14.75 MW Bouillante geothermal power plant located in Guadeloupe, a French island territory in the Caribbean . Pursuant to the terms of an Amended and Restated Investment Agreement (“ Investment Agreement”) and Shareholders Agreement with Sageos Holding (“Sageos”), a wholly owned subsidiary of Bureau de Recherches Géologiques et Minières (“BRGM”), the Company together with Caisse des Dépôts et Consignations (“CDC”), a French state-owned financial organization, acquired an approximately 80% interest in GB, allocated 75% to the Company and 25% to CDC. Pursuant to the agreements, the Com pany paid approximately $20.6 million to Sageos for its approximately 60% interest in GB and committed to further invest $8.4 million (approximately €7.5 million) in the two years following the acquisition, which will increase its interest to 63.75%. Under the Investment Agreement, the Company may pay Sageos an additional amount of up to $13.4 million (linked to the Euro-U.S. Dollar exchange rate) subject to the achievement of agreed production thresholds and capacity expansion within a defined time period. During fiscal year 2017, the Company paid approximately $8.0 million dollars, net, for achieving certain production thresholds and may pay additional amounts of up to $3.6 million The Bouillante power plant sells its electricity under a 15 -year PPA that was entered into in February 2016 with Électricité de France S.A. (“EDF”), the French electric utility. The Company accounted for the transaction based on the provision of Accounting Standard Codification 805, Business Combinations, and consequently re corded intangible asset of $33.0 million pertaining to the 15 -year PPA with EDF and $7.1 million of goodwill. Additionally, following the transaction, the Company gained control over GB effective July 5, 2016 and consolidated the entity with redeemable noncontrolling interest of $5.0 million and noncontrolling interest of $8.3 million being recorded. The redeemable noncontrolling interest pertains to Sageos right to sell its equity interest in GB to the Company for cash considerations. The noncontrolling interest pertains to CDC and was included under noncontrolling interest in the consolidated statements of equity .

NOTE

—BUSINESS ACQUISITIONS AND OTHERS

ORIX transaction

July 26, 2017,

the Company announced that ORIX Corporation (“ORIX”) closed its acquisition of approximately

million shares of the Company

’s common stock, representing an approximately

22%

ownership stake in the Company, from FIMI ENRG Limited Partnership, FIMI ENRG, L.P., Bronicki Investments, Ltd. and certain senior members of the Company’s management team pursuant to a stock purchase agreement entered into by ORIX and the selling stockholders on

May 4, 2017.

In connection with the acquisition, on

May 4, 2017,

the Company entered into certain related agreements with ORIX, including a Governance Agreement, a Commercial Cooperation Agreement and a Registration Rights Agreement, following the unanimous recommendation of a special committee of the Board that was formed to evaluate and negotiate the stockholder arrangements proposed by ORIX, and following approval by the full Board. The closing of the transactions contemplated by the related agreements between ORIX and the Company also occurred on

July 26, 2017.

Under the Governance Agreement, ORIX has the right to designate

three

persons to the Board, which was expanded to

nine

directors, and also propose a

fourth

person to be mutually agreed by the Company and ORIX to serve as a new independent director on the Board. In addition, for so long as ORIX is entitled to board representation pursuant to the Governance Agreement, ORIX will be subject to certain customary standstill restrictions, including an effective

25%

cap on its voting rights. Pursuant to the Registration Rights Agreement, ORIX also has certain customary registration rights with respect to the shares of the Company

’s common stock that it owns.

Under the Commercial Cooperation Agreement, the Company has exclusive rights to develop, own, operate and provide equipment for ORIX geothermal energy projects in all markets outside of Japan. In addition, the Company has certain rights to serve as technical partner and co-invest in ORIX geothermal energy projects in Japan. ORIX will also assist the Company in obtaining project financing for its geothermal energy projects from a variety of leading providers of renewable energy debt financing with which ORIX has relationships in Asia and around the world.

Viridity transaction

March 15, 2017,

the Company completed the acquisition of substantially all of the business and assets of Viridity Energy, Inc., a privately held Philadelphia-based company formerly engaged in the provision of demand response, energy management and energy storage services. At closing, Viridity Energy Solutions Inc. (“Viridity”), a wholly owned subsidiary of the Company, paid initial consideration of

$35.3

million. Additional contingent consideration with an estimated fair value of

$12.4

million

may

be payable upon the achievement of certain performance milestones to be measured at the end of fiscal years

2017

and

2020.

The

first

performance milestone measured at the end of

2017

was

not

achieved and as a result, the Company reversed the related liability in the amount of

$0.6

million which was recorded under general and administrative expenses. Additionally, as of

December 31, 2017,

the contingent consideration amounted to

$10.3

million.

Using proprietary software and solutions, Viridity serves primarily retail energy providers, utilities, and large commercial and industrial customers. Viridity

’s offerings enable its customers to optimize and monetize their energy management, demand response and storage facilities potential by interacting on their behalf with regional transmission organizations and independent system operators.

The Company accounted for the transaction in accordance with Accounting Standard Codification

805,

Business Combinations, and consequently recorded intangible assets of

$34.7

million primarily relating to Viridity

’s storage activities with a weighted-average

amortization period of

years, approximately

$0.4

million of working capital and fixed assets and

$13.4

million of goodwill. Following the transaction, the Company consolidated Viridity in accordance with Accounting Standard Codification

810,

Consolidation. The acquisition enabled the Company to enter the growing energy storage and demand response markets and expand its market presence.

The revenues of Viridity for the period from

March 15, 2017

December 31, 2017

were included in the Company’s consolidated statements of operations and comprehensive income for the year ended

December 31, 2017.

Guadeloupe power plant transaction

July 2016,

the Company closed its acquisition of Geothermie Bouillante SA (“

GB”). GB owns and operates the

14.75

MW Bouillante geothermal power plant located in Guadeloupe, a French island territory in the Caribbean

Pursuant to the terms of an Amended and Restated Investment Agreement (“

Investment Agreement”) and Shareholders Agreement with Sageos Holding (“Sageos”), a wholly owned subsidiary of Bureau de Recherches Géologiques et Minières (“BRGM”), the Company together with Caisse des Dépôts et Consignations (“CDC”), a French state-owned financial organization, acquired an approximately

80%

interest in GB, allocated

75%

to the Company and

25%

to CDC.

Pursuant to the agreements, the Com

pany paid approximately

$20.6

million to Sageos for its approximately

60%

interest in GB and committed to further invest

$8.4

million (approximately

€7.5

million) in the

two

years following the acquisition, which will increase its interest to

63.75%.

Under the Investment Agreement, the Company

may

pay Sageos an additional amount of up to

$13.4

million (linked to the Euro-U.S. Dollar exchange rate) subject to the achievement of agreed production thresholds and capacity expansion within a defined time period. During fiscal year

2017,

the Company paid approximately

$8.0

million dollars, net, for achieving certain production thresholds and

may

pay additional amounts of up to

$3.6

million

The Bouillante power plant sells its electricity under a

-year PPA that was entered into in

February 2016

with Électricité de France S.A. (“EDF”), the French electric utility.

The Company accounted for the transaction based on the provision of Accounting Standard Codification

805,

Business Combinations, and consequently re

corded intangible asset of

$33.0

million pertaining to the

-year PPA with EDF and

$7.1

million of goodwill. Additionally, following the transaction, the Company gained control over GB effective

July 5, 2016

and consolidated the entity with redeemable noncontrolling interest of

$5.0

million and noncontrolling interest of

$8.3

million being recorded. The redeemable noncontrolling interest pertains to Sageos right to sell its equity interest in GB to the Company for cash considerations. The noncontrolling interest pertains to CDC and was included under noncontrolling interest in the consolidated statements of equity