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Note 19 - Business Segments - Revenue From Major Customers (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues | [1] | $ 692,812 | $ 662,591 | $ 594,644
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 Products 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Details
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