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Note 19 - Business Segments (Restated) - Revenue From Major Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues |  | $ 166,365 | $ 157,185 | $ 179,364 | $ 189,898 | $ 166,519 | $ 184,617 | $ 159,861 | $ 151,594 | $ 692,812 | [1] | $ 662,591 | [1] | $ 594,644 | [1]
Southern California Edison Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [2] |  |  |  |  |  |  |  |  | $ 29,714 |  | $ 33,552 |  | $ 56,026 |
Percentage of revenues | [2] |  |  |  |  |  |  |  |  | 4.30% |  | 5.10% |  | 9.40% |
Hawaii Electric Light Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [2] |  |  |  |  |  |  |  |  | $ 70,100 |  | $ 67,566 |  | $ 30,947 |
Percentage of revenues | [2] |  |  |  |  |  |  |  |  | 10.10% |  | 10.20% |  | 5.20% |
Sierra Pacific Power Company And Nevada Power Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [2],[3] |  |  |  |  |  |  |  |  | $ 125,424 |  | $ 127,226 |  | $ 115,876 |
Percentage of revenues | [2],[3] |  |  |  |  |  |  |  |  | 18.10% |  | 19.20% |  | 19.50% |
Hyundai [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [4] |  |  |  |  |  |  |  |  | $ 28,968 |  | $ 100,856 |  | $ 93,131 |
Percentage of revenues | [4] |  |  |  |  |  |  |  |  | 4.20% |  | 15.20% |  | 15.70% |
Kenya Power and Lighting Co LTD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | [2] |  |  |  |  |  |  |  |  | $ 110,243 |  | $ 109,270 |  | $ 86,545 |
Percentage of revenues | [2] |  |  |  |  |  |  |  |  | 15.90% |  | 16.50% |  | 14.60% |
[1] | Revenues as reported in the geographic area in which they originate.
[2] | Revenues reported in Electricity segment.
[3] | Subsidiaries of NV Energy, Inc.
[4] | Revenues related to the Sarulla project that are reported in Product segment.

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- Definition The percentage of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 + Details
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