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Note 6 - Segment Reporting - Net Sales by Products and Services (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Residential Power Products [Member]        
As reported $ 192,856 $ 184,968 $ 533,572 $ 475,268
Commercial and Industrial Power Products [Member]        
As reported 149,676 148,234 409,396 416,577
Other Products and Services [Member]        
As reported 30,589 26,089 84,064 67,624
As reported $ 373,121 $ 359,291 $ 1,027,032 $ 959,469