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Note 3 - Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
    Finland     Harrison
Street		     Other     Aggregate
Acquisitions		  
                         
Current assets, excluding cash   $
4,734
     $
16,948
     $
31,623
     $
53,305
  
Non-current assets    
2,581
      
4,678
      
3,616
      
10,875
  
Current liabilities    
(9,421
 )    
(14,544
 )    
(27,853
 )    
(51,818
 )
Long-term liabilities    
(6,072
 )    
-
      
(15,608
 )    
(21,680
 )
    $
(8,178
 )   $
7,082
     $
(8,222
 )   $
(9,318
 )
                                 
Cash consideration, net of cash acquired of $23,777   $
(57,287
 )   $
(447,513
 )   $
(81,442
 )   $
(586,242
 )
Acquisition date fair value of contingent consideration    
-
      
(40,889
 )    
(19,212
 )    
(60,101
 )
Total purchase consideration   $
(57,287
 )   $
(488,402
 )   $
(100,654
 )   $
(646,343
 )
                                 
Acquired intangible assets   $
26,841
     $
278,600
     $
69,495
     $
374,936
  
Acquired goodwill   $
38,624
     $
366,350
     $
60,708
     $
465,682
  
Redeemable non-controlling interest   $
-
     $
163,630
     $
21,327
     $
184,957
  
    Northern
California
& Nevada		     Other     Aggregate
Acquisitions		  
                   
Current assets, excluding cash   $
8,503
     $
5,420
     $
13,923
  
Non-current assets    
2,268
      
1,117
      
3,385
  
Current liabilities    
(38,481
 )    
(10,463
 )    
(48,944
 )
Long-term liabilities    
(10,600
 )    
(3,084
 )    
(13,684
 )
    $
(38,310
 )   $
(7,010
 )   $
(45,320
 )
                         
Cash consideration, net of cash acquired of $41,989   $
(22,696
 )   $
(35,978
 )   $
(58,674
 )
Acquisition date fair value of contingent consideration    
(10,412
 )    
(9,135
 )    
(19,547
 )
Total purchase consideration   $
(33,108
 )   $
(45,113
 )   $
(78,221
 )
                         
Acquired intangible assets   $
28,800
     $
32,428
     $
61,228
  
Acquired goodwill   $
42,618
     $
35,953
     $
78,571
  
Redeemable non-controlling interest   $
-
     $
16,258
     $
16,258
  
    Revenues     Net earnings  
                 
Actual from acquired entities for 2018   $
196,480
     $
10,879
  
Supplemental pro forma for 2018 (unaudited)    
2,934,211
      
139,297
  
Supplemental pro forma for 2017 (unaudited)    
2,738,081
      
118,078