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Note 3 - Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Business Acquisitions, by Acquisition [Table Text Block]
    Northern California              
    & Nevada     Other    
Aggregate
  
    Acquisition     Acquisitions    
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
 )
Redeemable non-controlling interest    
-
      
(16,258
 )    
(16,258
 )
    $
(38,310
 )   $
(23,268
 )   $
(61,578
 )
                         
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
  
Goodwill   $
42,618
     $
35,953
     $
78,571
  
    Aggregate  
    Acquisitions  
       
Current assets, excluding cash
   $
16,643
  
Non-current assets    
3,719
  
Current liabilities    
(18,556
 )
Long-term liabilities    
(4,207
 )
Non-controlling interests    
(25
 )
    $
(2,426
 )
         
Cash consideration, net of cash acquired of $10,067    
(82,073
 )
Acquisition date fair value of contingent consideration    
(12,056
 )
Total purchase consideration   $
(94,129
 )
         
Acquired intangible assets   $
43,602
  
Goodwill   $
52,954
  
Business Acquisition, Pro Forma Information [Table Text Block]
      Revenues       Net earnings  
         
Actual from acquired entities for 2017   $
215,174
     $
7,377
  
Supplemental pro forma for 2017 (unaudited)    
2,299,891
      
93,145
  
Supplemental pro forma for 2016 (unaudited)    
2,150,685
      
100,105