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Note 4 - Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
    Aggregate
Acquisitions		  
       
Current assets   $
22,383
  
Long-term assets    
6,961
  
Current liabilities    
(12,049
 )
Deferred Tax Liabilities    
(4,230
 )
Redeemable non-controlling interest    
(19,889
 )
    $
(6,824
 )
         
Note consideration   $
(1,035
 )
Cash consideration, net of cash acquired of $3,038    
(59,444
 )
Acquisition date fair value of contingent consideration    
(4,536
 )
Total purchase consideration   $
(65,015
 )
         
Acquired intangible assets   $
28,960
  
Goodwill   $
42,879
  
    Aggregate
Acquisitions		  
       
Current assets   $
9,593
  
Non-current assets    
3,394
  
Current liabilities    
(8,495
 )
Long-term liabilities    
(850
 )
Deferred Tax Liabilities    
(3,408
 )
Redeemable non-controlling interest    
(3,360
 )
    $
(3,126
 )
         
Note consideration    
(1,000
 )
Cash consideration, net of cash acquired of $1,426   $
(39,573
 )
Acquisition date fair value of contingent consideration    
(9,280
 )
Total purchase consideration   $
(49,853
 )
         
Acquired intangible assets   $
23,589
  
Goodwill   $
29,390
  
Business Acquisition, Pro Forma Information [Table Text Block]
    Revenues     Net earnings  
             
Actual from acquired entities for 2018   $
54,458
     $
5,695
  
Supplemental pro forma for 2018 (unaudited)    
1,985,656
      
92,371
  
Supplemental pro forma for 2017 (unaudited)    
1,876,724
      
82,635