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Note 9 - Intangible Assets and Goodwill | 12 Months Ended
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Dec. 31, 2017
Notes to Financial Statements |
Intangible Assets Disclosure [Text Block] | NOTE 9 — INTANGIBLE ASSETS AND GOODWILL Intangible assets amounting to $85.4 million and $52.8 million consist mainly of the Company’s PPAs acquired in business combinations and Viridity’s storage activities, net of accumulated amortization of $50.0 million and $42.8 million as of December 31, 2017 and 2016, respectively. Intangible assets relating to our storage activities, as of December 31, 2017, amounted to $33.8 million, net of accumulated amortization of $1.7 million. Amortization expense for the years ended December 31, 2017, 2016, and 2015 amounted to $6.9 million, $4.4 million, and $3.3 million, respectively. Additions to intangible assets for the years ended December 31, 2017, 2016 and 2015, amounted to $35.6 million, $33.0 million and $0.5 million, respectively. The additions to intangible assets in 2017 and 2016 primarily relate to the Viridity acquisition and the purchase of the Guadeloupe plant, respectively. There were no disposals of intangible assets in 2017, 2016 and 2015. Estimated future amortization expense for the intangible assets as of December 31, 2017 is as follows:
|  | (Dollars in thousands) |
Year ending December 31: |  |  |  |
2018 |  | $ | 7,129 |
2019 |  |  | 7,056 |
2020 |  |  | 6,739 |
2021 |  |  | 6,739 |
2022 |  |  | 6,483 |
Thereafter |  |  | 51,274 |
Total |  | $ | 85,420 |
Goodwill Goodwill amounting to $21.0 million and $6.7 million as of December 31, 2017 and 2016, respectively, represents the excess of the fair value of considerations transferred in the Guadeloupe and Viridity business combination transactions over the fair value of tangible and intangible assets acquired, net of the fair value of liabilities assumed and non-controlling interest (as applicable) in the acquisitions. During 2017 and 2016, the Company recorded an increase to the carrying value of Goodwill in the amount of $13.5 million and $7.1 million as a result of the Viridity and Guadeloupe business combination transactions, respectively. Except for the additions mentioned above, there were no additions or adjustments to the carrying value of goodwill except for the impact of currency translation adjustments.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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