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Note 6 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Net sales $ 395,376 $ 367,376 $ 727,190 $ 653,911
Residential Power Products [Member]        
Net sales 198,117 181,735 352,973 340,716
Commercial and Industrial Power Products [Member]        
Net sales 170,755 156,730 322,198 259,720
Other Products and Services [Member]        
Net sales $ 26,504 $ 28,911 $ 52,019 $ 53,475