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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.