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Note 8 - Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Goodwill [Table Text Block]
   
Domesti
c
    
Internationa
l
    
Total
  
Balance at December 31, 201
5
   $
621,451
     $
48,268
     $
669,719
  
Acquisitions of businesses, ne
t
    
-
      
46,202
      
46,202
  
Foreign currency translatio
n
    
-
      
(11,281
 )    
(11,281
 )
Balance at December 31, 201
6
    
621,451
      
83,189
      
704,640
  
Acquisitions of businesses, ne
t
    
-
      
5,271
      
5,271
  
Foreign currency translatio
n
    
-
      
11,612
      
11,612
  
Balance at December 31, 201
7
   $
621,451
     $
100,072
     $
721,523
  
   
Year Ended December 31, 201
7
    
Year Ended December 31, 201
6
  
   
Gros
s
    
Accumulated Impairmen
t
    
Ne
t
    
Gros
s
    
Accumulated Impairmen
t
    
Ne
t
  
Domesti
c
   $
1,124,644
     $
(503,193
 )   $
621,451
     $
1,124,644
     $
(503,193
 )   $
621,451
  
Internationa
l
    
104,683
      
(4,611
 )    
100,072
      
87,800
      
(4,611
 )    
83,189
  
Tota
l
   $
1,229,327
     $
(507,804
 )   $
721,523
     $
1,212,444
     $
(507,804
 )   $
704,640
  
Schedule Of Intangible Assets [Table Text Block]
   
Weighted Averag
e
    
December 31, 201
7
    
December 31, 201
6
  
   
Amortization Year
s
    
Gros
s
    
Accumulated Amortizatio
n
    
Net Book Valu
e
    
Gros
s
    
Accumulated Amortizatio
n
    
Net Book Valu
e
  
Finite-lived intangible assets
:
                                                        
Tradename
s
    
9
     $
52,784
     $
(28,422
 )   $
24,362
     $
50,742
     $
(20,189
 )   $
30,553
  
Customer list
s
    
10
      
340,138
      
(299,074
 )    
41,064
      
333,935
      
(288,623
 )    
45,312
  
Patent
s
    
14
      
131,137
      
(91,520
 )    
39,617
      
130,099
      
(82,038
 )    
48,061
  
Unpatented technolog
y
    
15
      
13,169
      
(11,915
 )    
1,254
      
13,169
      
(11,771
 )    
1,398
  
Softwar
e
    
-
      
1,046
      
(1,046
 )    
-
      
1,046
      
(1,046
 )    
-
  
Non-compete/othe
r
    
8
      
2,684
      
(1,537
 )    
1,147
      
2,513
      
(986
 )    
1,527
  
Total finite-lived intangible asset
s
     $
540,958
     $
(433,514
 )   $
107,444
     $
531,504
     $
(404,653
 )   $
126,851
  
Indefinite-lived tradename
s
    
 
      
128,321
      
-
      
128,321
      
128,321
      
-
      
128,321
  
Total intangible asset
s
    
 
     $
669,279
     $
(433,514
 )   $
235,765
     $
659,825
     $
(404,653
 )   $
255,172