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Note 6 - Net Sales by Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Residential Power Products [Member]      
Net sales $ 673,764 $ 722,206 $ 843,727
Commercial and Industrial Power Products [Member]      
Net sales 548,440 652,216 569,890
Other Products and Services [Member]      
Net sales 95,095 86,497 72,148
Net sales $ 1,317,299 $ 1,460,919 $ 1,485,765