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Note 8 - Business Segments - Summarized Financial Information Concerning Reportable Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Revenues $ 192,113 $ 199,038  
Operating income (loss) 61,057 53,725  
Segment assets at period end 3,445,613 [1],[2] 3,143,214 [1],[3] $ 3,250,494
Intersegment Eliminations [Member]      
Revenues 8,656 18,261  
Segment Reconciling Items [Member]      
Segment assets at period end 76,008 71,885  
Electricity Segment [Member]      
Revenues 142,856 142,908  
Operating income (loss) 58,630 51,551  
Segment assets at period end [1] 3,139,603 [2] 2,950,444 [3]  
Electricity Segment [Member] | Intersegment Eliminations [Member]      
Revenues 0 0  
Electricity Segment [Member] | Segment Reconciling Items [Member]      
Segment assets at period end 76,008 71,885  
Product Segment [Member]      
Revenues 47,411 52,128  
Operating income (loss) 3,872 4,252  
Segment assets at period end [1] 230,831 [2] 125,248 [3]  
Product Segment [Member] | Intersegment Eliminations [Member]      
Revenues 8,656 18,261  
Product Segment [Member] | Segment Reconciling Items [Member]      
Segment assets at period end 0 0  
Other Segments [Member]      
Revenues 1,846 4,002  
Operating income (loss) (1,445) (2,078)  
Segment assets at period end [1] 75,179 [2] 67,522 [3]  
Other Segments [Member] | Intersegment Eliminations [Member]      
Revenues 0 0  
Other Segments [Member] | Segment Reconciling Items [Member]      
Segment assets at period end 0 0  
UNITED STATES      
Revenues [4] 93,936 106,773  
UNITED STATES | Electricity Segment [Member]      
Revenues [4] 91,692 91,528  
UNITED STATES | Product Segment [Member]      
Revenues [4] 398 11,243  
UNITED STATES | Other Segments [Member]      
Revenues [4] 1,846 4,002  
Non-US [Member]      
Revenues [5] 98,177 92,265  
Non-US [Member] | Electricity Segment [Member]      
Revenues [5] 51,164 51,380  
Non-US [Member] | Product Segment [Member]      
Revenues [5] 47,013 40,885  
Non-US [Member] | Other Segments [Member]      
Revenues [5] $ 0 $ 0  
[1] Electricity segment assets include goodwill in the amount of $20.0 million and $20.1 million as of March 31, 2020 and 2019, respectively. No goodwill is included in the Product and ESMS segment assets as of March 31, 2020 and 2019.
[2] Including unconsolidated investments 76,008 76,008
[3] Including unconsolidated investments 71,885 71,885
[4] Electricity segment revenues in the United States are all accounted under lease accounting except for $16.8 million and $17.0 million in the three months ended March 31, 2020 and 2019, respectively, that are accounted under ASC 606. Product and ESMS segment revenues in the United States are accounted under ASC 606.
[5] Electricity segment revenues in foreign countries are all accounted under lease accounting. Product segment revenues in foreign countries are accounted under ASC 606.