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Note 3 - Intangible Assets, Net - Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Total gross amount $ 116,693 $ 112,190
Total accumulated amortization 85,979 76,443
Total accumulated amortization (85,979) (76,443)
Intangible assets, net $ 30,714 35,747
Computer Software, Intangible Asset [Member]    
Amortization period (Year) 3 years  
Total gross amount $ 12,842 9,552
Total accumulated amortization (7,301) (5,263)
Total accumulated amortization 7,301 5,263
Intangible assets, net 5,541 4,289
Acquired Proprietary Technology [Member]    
Total gross amount 15,871 14,844
Total accumulated amortization (14,131) (13,402)
Total accumulated amortization 14,131 13,402
Intangible assets, net $ 1,740 1,442
Acquired Proprietary Technology [Member] | Minimum [Member]    
Amortization period (Year) 3 years  
Customer Relationships [Member]    
Total gross amount $ 38,068 37,886
Total accumulated amortization (34,053) (29,948)
Total accumulated amortization 34,053 29,948
Intangible assets, net $ 4,015 7,938
Customer Relationships [Member] | Minimum [Member]    
Amortization period (Year) 5 years  
Trade Names [Member]    
Total gross amount $ 16,657 16,657
Total accumulated amortization (5,815) (5,145)
Total accumulated amortization 5,815 5,145
Intangible assets, net $ 10,842 11,512
Trade Names [Member] | Minimum [Member]    
Amortization period (Year) 4 years  
Internet Domain Names [Member]    
Amortization period (Year) 20 years  
Total gross amount $ 195 191
Total accumulated amortization (65) (58)
Total accumulated amortization 65 58
Intangible assets, net 130 133
Database Rights [Member]    
Total gross amount 31,292 31,292
Total accumulated amortization (22,846) (20,859)
Total accumulated amortization 22,846 20,859
Intangible assets, net $ 8,446 10,433
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)
Total accumulated amortization $ 1,768 $ 1,768
Noncompete Agreements [Member] | Minimum [Member]    
Amortization period (Year) 2 years