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Note 6 - Acquisitions - Amounts Assigned to Intangible Assets (Details) - The 2021 Acquisitions [Member] $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Total intangible assets	$ 25.3
Technology [Member]
Weighted average useful life (Year)	4 years
Total intangible assets	$ 5.6
Marketing [Member]
Weighted average useful life (Year)	5 years
Total intangible assets	$ 1.0
Customer [Member]
Weighted average useful life (Year)	11 years
Total intangible assets	$ 16.3
Database [Member]
Weighted average useful life (Year)	2 years
Total intangible assets	$ 2.4

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275

+ Details

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Period Type:	duration

X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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