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Note 6 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net sales $ 331,814 $ 286,535
Residential Power Products [Member]    
Net sales 154,856 158,980
Commercial and Industrial Power Products [Member]    
Net sales 151,443 102,991
Other Products and Services [Member]    
Net sales $ 25,515 $ 24,564