Note 3 - Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Total gross amount	$ 106,386	$ 105,721
Total accumulated amortization	(53,666)	(50,118)
Intangible assets, net	$ 52,720	55,603
Computer Software, Intangible Asset [Member]
Amortization period (Year)	3 years
Total gross amount	$ 5,473	4,866
Total accumulated amortization	(2,369)	(1,995)
Intangible assets, net	3,104	2,871
Acquired Proprietary Technology [Member]
Total gross amount	13,719	13,661
Total accumulated amortization	(10,232)	(9,516)
Intangible assets, net	$ 3,487	4,145
Acquired Proprietary Technology [Member] \| Minimum [Member]
Amortization period (Year)	4 years
Acquired Proprietary Technology [Member] \| Maximum [Member]
Amortization period (Year)	5 years
Customer Relationships [Member]
Total gross amount	$ 37,286	37,286
Total accumulated amortization	(20,689)	(19,396)
Intangible assets, net	$ 16,597	17,890
Customer Relationships [Member] \| Minimum [Member]
Amortization period (Year)	6 years
Customer Relationships [Member] \| Maximum [Member]
Amortization period (Year)	10 years
Trade Names [Member]
Total gross amount	$ 16,657	16,657
Total accumulated amortization	(3,583)	(3,359)
Intangible assets, net	$ 13,074	13,298
Trade Names [Member] \| Minimum [Member]
Amortization period (Year)	4 years
Trade Names [Member] \| Maximum [Member]
Amortization period (Year)	20 years
Internet Domain Names [Member]
Amortization period (Year)	20 years
Total gross amount	$ 191	191
Total accumulated amortization	(41)	(39)
Intangible assets, net	150	152
Database Rights [Member]
Total gross amount	31,292	31,292
Total accumulated amortization	(15,084)	(14,182)
Intangible assets, net	$ 16,208	17,110
Database Rights [Member] \| Minimum [Member]
Amortization period (Year)	5 years
Database Rights [Member] \| Maximum [Member]
Amortization period (Year)	10 years
Noncompete Agreements [Member]
Total gross amount	$ 1,768	1,768
Total accumulated amortization	(1,668)	(1,631)
Intangible assets, net	$ 100	$ 137
Noncompete Agreements [Member] \| Minimum [Member]
Amortization period (Year)	2 years
Noncompete Agreements [Member] \| Maximum [Member]
Amortization period (Year)	5 years

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
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