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Note 9 - Intangible Assets and Goodwill (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 15, 2017
Finite-Lived Intangible Assets, Net, Ending Balance | $ 85,420 |  |  |
Amortization of Intangible Assets, Total | 6,900 | $ 4,400 | $ 3,300 |
Increase (Decrease) in Intangible Assets, Current | 35,600 | 33,000 | 500 |
Finite Lived Intangible Assets, Disposals | 0 | 2,016,000 | $ 0 |
Goodwill, Ending Balance | 21,037 | 6,650 |  |
Viridity Energy, Inc. [Member] |  |  |  |
Goodwill, Ending Balance |  |  |  | $ 13,400
Goodwill, Acquired During Period | 13,500 |  |  |
Guadeloupe Power Plant Transaction [Member] |  |  |  |
Goodwill, Acquired During Period |  | 7,100 |  |
Power Purchase Agreements and Intangible Assets Related to Storage Activities [Member] |  |  |  |
Finite-Lived Intangible Assets, Net, Ending Balance | 85,400 | 52,800 |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 50,000 | $ 42,800 |  |
Intangible Assets Related to Storage Activities [Member] |  |  |  |
Finite-Lived Intangible Assets, Net, Ending Balance | 33,800 |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 1,700 |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition The increase (decrease) during the reporting period in intangible assets (for example patents and licenses). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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