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Note 18 - Quarterly Financial Information (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Quarterly Financial Information [Table Text Block]
 
 
Quarters Ended 201
5
 
 
 
Q1
 
 
Q2
 
 
Q3
 
 
Q4
 
Net sales
  $ 311,818     $ 288,360     $ 359,291     $ 357,830  
Gross profit
    102,603       95,897       130,326       131,124  
Operating income
    44,911       39,467       67,867       27,316  
Net income
    19,685       14,844       34,036       9,182  
Net income per common share, basic:
  $ 0.29     $ 0.22     $ 0.50     $ 0.14  
Net income per common share, diluted:
  $ 0.28     $ 0.21     $ 0.49     $ 0.14  
 
 
Quarters Ended 201
4
 
 
 
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