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Note 3 - Intangible Assets, Net - Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Total gross amount $ 108,419 $ 105,721
Total accumulated amortization (57,325) (50,118)
Intangible assets, net $ 51,094 55,603
Computer Software, Intangible Asset [Member]    
Amortization period (Year) 3 years  
Total gross amount $ 5,987 4,866
Total accumulated amortization (2,752) (1,995)
Intangible assets, net 3,235 2,871
Acquired Proprietary Technology [Member]    
Total gross amount 14,638 13,661
Total accumulated amortization (11,021) (9,516)
Intangible assets, net $ 3,617 4,145
Acquired Proprietary Technology [Member] | Minimum [Member]    
Amortization period (Year) 3 years  
Customer Relationships [Member]    
Total gross amount $ 37,886 37,286
Total accumulated amortization (22,011) (19,396)
Intangible assets, net $ 15,875 17,890
Customer Relationships [Member] | Minimum [Member]    
Amortization period (Year) 5 years  
Trade Names [Member]    
Total gross amount $ 16,657 16,657
Total accumulated amortization (3,806) (3,359)
Intangible assets, net $ 12,851 13,298
Trade Names [Member] | Minimum [Member]    
Amortization period (Year) 4 years  
Internet Domain Names [Member]    
Amortization period (Year) 20 years  
Total gross amount $ 191 191
Total accumulated amortization (44) (39)
Intangible assets, net 147 152
Database Rights [Member]    
Total gross amount 31,292 31,292
Total accumulated amortization (15,987) (14,182)
Intangible assets, net $ 15,305 17,110
Database Rights [Member] | Minimum [Member]    
Amortization period (Year) 5 years  
Noncompete Agreements [Member]    
Total gross amount $ 1,768 1,768
Total accumulated amortization (1,704) (1,631)
Intangible assets, net $ 64 $ 137
Noncompete Agreements [Member] | Minimum [Member]    
Amortization period (Year) 2 years