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Note 3 - Intangible Assets, Net - Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Total gross amount $ 111,020 $ 109,958
Total accumulated amortization (70,542) (64,541)
Intangible assets, net $ 40,478 45,417
Computer Software, Intangible Asset [Member]    
Amortization period (Year) 3 years  
Total gross amount $ 8,381 7,376
Total accumulated amortization (4,249) (3,551)
Intangible assets, net 4,132 3,825
Acquired Proprietary Technology [Member]    
Total gross amount 14,845 14,788
Total accumulated amortization (12,936) (12,474)
Intangible assets, net $ 1,909 2,314
Acquired Proprietary Technology [Member] | Minimum [Member]    
Amortization period (Year) 3 years  
Customer Relationships [Member]    
Total gross amount $ 37,886 37,886
Total accumulated amortization (27,303) (24,657)
Intangible assets, net $ 10,583 13,229
Customer Relationships [Member] | Minimum [Member]    
Amortization period (Year) 5 years  
Trade Names [Member]    
Total gross amount $ 16,657 16,657
Total accumulated amortization (4,699) (4,252)
Intangible assets, net $ 11,958 12,405
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 (53) (48)
Intangible assets, net 138 143
Database Rights [Member]    
Total gross amount 31,292 31,292
Total accumulated amortization (19,534) (17,791)
Intangible assets, net $ 11,758 13,501
Database Rights [Member] | Minimum [Member]    
Amortization period (Year) 5 years  
Noncompete Agreements [Member]    
Total gross amount $ 1,768 1,768
Total accumulated amortization $ (1,768) $ (1,768)
Noncompete Agreements [Member] | Minimum [Member]    
Amortization period (Year) 2 years