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Note 3 - Acquisitions - Acquisitions Details (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Current assets, excluding cash $ 13,923  
Non-current assets 3,385 $ 3,719
Current liabilities (48,944) (18,556)
Long-term liabilities (13,684) (4,207)
Redeemable non-controlling interest (16,258)  
Net identifiable assets acquired (61,578) (2,426)
Cash consideration, net of cash acquired (58,674) (82,073)
Acquisition date fair value of contingent consideration (19,547) (12,056)
Total purchase consideration (78,221) (94,129)
Acquired intangible assets 61,228 43,602
Goodwill acquired during the year 78,571 52,954
Current assets, excluding cash   16,643
Non-controlling interests   $ (25)
Northern California & Nevada [Member]    
Current assets, excluding cash 8,503  
Non-current assets 2,268  
Current liabilities (38,481)  
Long-term liabilities (10,600)  
Redeemable non-controlling interest  
Net identifiable assets acquired (38,310)  
Cash consideration, net of cash acquired (22,696)  
Acquisition date fair value of contingent consideration (10,412)  
Total purchase consideration (33,108)  
Acquired intangible assets 28,800  
Goodwill acquired during the year 42,618  
Other Acquisitions [Member]    
Current assets, excluding cash 5,420  
Non-current assets 1,117  
Current liabilities (10,463)  
Long-term liabilities (3,084)  
Redeemable non-controlling interest (16,258)  
Net identifiable assets acquired (23,268)  
Cash consideration, net of cash acquired (35,978)  
Acquisition date fair value of contingent consideration (9,135)  
Total purchase consideration (45,113)  
Acquired intangible assets 32,428  
Goodwill acquired during the year $ 35,953