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Note 3 - Intangible Assets, Net - Intangible Assets (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Total gross amount $ 115,561 $ 112,190
Total accumulated amortization 82,689 76,443
Total accumulated amortization (82,689) (76,443)
Intangible assets, net $ 32,872 35,747
Computer Software, Intangible Asset [Member]    
Amortization period (Year) 3 years  
Total gross amount $ 11,757 9,552
Total accumulated amortization (6,546) (5,263)
Total accumulated amortization 6,546 5,263
Intangible assets, net 5,211 4,289
Acquired Proprietary Technology [Member]    
Total gross amount 15,824 14,844
Total accumulated amortization (13,851) (13,402)
Total accumulated amortization 13,851 13,402
Intangible assets, net $ 1,973 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 (32,685) (29,948)
Total accumulated amortization 32,685 29,948
Intangible assets, net $ 5,383 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 (5,592) (5,145)
Total accumulated amortization 5,592 5,145
Intangible assets, net $ 11,065 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 (63) (58)
Total accumulated amortization 63 58
Intangible assets, net 132 133
Database Rights [Member]    
Total gross amount 31,292 31,292
Total accumulated amortization (22,184) (20,859)
Total accumulated amortization 22,184 20,859
Intangible assets, net $ 9,108 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