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Note 5 - Segment Reporting (Tables)
9 Months Ended
Sep. 30, 2014
Segment Reporting [Abstract]  
Revenue from External Customers by Products and Services [Table Text Block]
   

Three Months Ended September 30,

   

Nine Months Ended September 30,

 
   

2014

   

2013

   

2014

   

2013

 
                                 

Residential power products

  $ 183,747     $ 192,728     $ 527,308     $ 644,588  

Commercial & industrial power products

    146,411       151,488       467,248       411,995  

Other

    22,147       19,053       62,366       52,946  

Total

  $ 352,305     $ 363,269     $ 1,056,922     $ 1,109,529