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Note 6 - Net Sales by Products and Services (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Residential Power Products [Member]        
As reported $ 181,735 $ 133,466 $ 340,716 $ 290,300
Commercial and Industrial Power Products [Member]        
As reported 156,730 134,580 259,720 268,343
Other Products and Services [Member]        
As reported 28,911 20,314 53,475 41,535
As reported $ 367,376 $ 288,360 $ 653,911 $ 600,178