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Note 3 - Intangible Assets, Net - Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Total gross amount $ 111,601 $ 109,958
Total accumulated amortization (73,548) (64,541)
Total intangible assets, net $ 38,053 45,417
Computer Software, Intangible Asset [Member]    
Amortization period (Year) 3 years  
Total gross amount $ 8,963 7,376
Total accumulated amortization (4,811) (3,551)
Total intangible assets, net 4,152 3,825
Acquired Proprietary Technology [Member]    
Total gross amount 14,845 14,788
Total accumulated amortization (13,169) (12,474)
Total intangible assets, net $ 1,676 2,314
Acquired Proprietary Technology [Member] | Minimum [Member]    
Amortization period (Year) 3 years  
Customer Relationships [Member]    
Total gross amount $ 37,885 37,886
Total accumulated amortization (28,626) (24,657)
Total intangible assets, net $ 9,259 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 (4,922) (4,252)
Total intangible assets, net $ 11,735 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 (55) (48)
Total intangible assets, net 136 143
Database Rights [Member]    
Total gross amount 31,292 31,292
Total accumulated amortization (20,197) (17,791)
Total intangible assets, net $ 11,095 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