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Note 3 - Intangible Assets, Net - Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Total gross amount $ 114,407 $ 112,190
Total accumulated amortization 79,469 76,443
Total accumulated amortization (79,469) (76,443)
Intangible assets, net $ 34,938 35,747
Computer Software, Intangible Asset [Member]    
Amortization period (Year) 3 years  
Total gross amount $ 10,603 9,552
Total accumulated amortization (5,864) (5,263)
Total accumulated amortization 5,864 5,263
Intangible assets, net 4,739 4,289
Acquired Proprietary Technology [Member]    
Total gross amount 15,824 14,844
Total accumulated amortization (13,571) (13,402)
Total accumulated amortization 13,571 13,402
Intangible assets, net $ 2,253 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 (31,317) (29,948)
Total accumulated amortization 31,317 29,948
Intangible assets, net $ 6,751 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 (5,368) (5,145)
Total accumulated amortization 5,368 5,145
Intangible assets, net $ 11,289 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 (60) (58)
Total accumulated amortization 60 58
Intangible assets, net 135 133
Database Rights [Member]    
Total gross amount 31,292 31,292
Total accumulated amortization (21,521) (20,859)
Total accumulated amortization 21,521 20,859
Intangible assets, net $ 9,771 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