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Note 18 - Quarterly Financial Information (Unaudited)
12 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information [Text Block]

18. Quarterly Financial Information (Unaudited)


   

Quarters Ended 2014

 
   

Q1

   

Q2

   

Q3

   

Q4

 

Net sales

  $ 342,008     $ 362,609     $ 352,305     $ 403,997  

Gross profit

    119,514       128,012       130,283       138,410  

Operating income

    65,306       78,160       70,794       79,115  

Net income

    34,701       54,025       36,497       49,390  

Net income per common share, basic:

  $ 0.51     $ 0.79     $ 0.53     $ 0.72  

Net income per common share, diluted:

  $ 0.50     $ 0.77     $ 0.52     $ 0.70  

   

Quarters Ended 2013

 
   

Q1

   

Q2

   

Q3

   

Q4

 

Net sales

  $ 399,572     $ 346,688     $ 363,269     $ 376,236  

Gross profit

    153,462       130,953       139,463       145,682  

Operating income

    96,525       76,433       87,289       91,218  

Net income

    50,674       28,254       47,093       48,518  

Net income per common share, basic:

  $ 0.75     $ 0.41     $ 0.69     $ 0.71  

Net income per common share, diluted:

  $ 0.73     $ 0.40     $ 0.67     $ 0.69