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Note 6 - Segment Reporting (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Revenue from External Customers by Products and Services [Table Text Block]
 
 
Three Months Ended September 30,
 
 
Nine Months Ended September 30,
 
 
 
2015
 
 
2014
 
 
2015
 
 
2014
 
                                 
Residential products
  $ 184,967     $ 183,747     $ 475,268     $ 527,308  
Commercial & industrial products
    148,234       146,411       416,577       467,248  
Other
    26,090       22,147       67,624       62,366  
Total
  $ 359,291     $ 352,305     $ 959,469     $ 1,056,922