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Note 19 - Business Segments - Revenue From Major Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
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.