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Note 10 - Acquisitions - Amounts Assigned to Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
2020 Acquisitions [Member] |  |  |
Total intangible assets | $ 123.5 |  |
2019 Acquisitions [Member] |  |  |
Total intangible assets |  | $ 292.0 |
2018 Acquisition [Member] |  |  |
Total intangible assets |  |  | $ 54.4
Technology [Member] | 2020 Acquisitions [Member] |  |  |
Weighted average useful life (Year) | 11 years |  |
Total intangible assets | $ 30.8 |  |
Technology [Member] | 2019 Acquisitions [Member] |  |  |
Weighted average useful life (Year) |  | 6 years |
Total intangible assets |  | $ 81.9 |
Technology [Member] | Acquisitions 2018 [Member] |  |  |
Weighted average useful life (Year) |  |  | 6 years
Technology [Member] | 2018 Acquisition [Member] |  |  |
Total intangible assets |  |  | $ 30.3
Marketing [Member] | 2020 Acquisitions [Member] |  |  |
Weighted average useful life (Year) | 5 years |  |
Total intangible assets | $ 2.1 |  |
Marketing [Member] | 2019 Acquisitions [Member] |  |  |
Weighted average useful life (Year) |  | 4 years |
Total intangible assets |  | $ 3.9 |
Marketing [Member] | 2018 Acquisition [Member] |  |  |
Weighted average useful life (Year) |  |  | 9 years
Total intangible assets |  |  | $ 4.0
Customer [Member] | 2020 Acquisitions [Member] |  |  |
Weighted average useful life (Year) | 11 years |  |
Total intangible assets | $ 90.6 |  |
Customer [Member] | 2019 Acquisitions [Member] |  |  |
Weighted average useful life (Year) |  | 12 years |
Total intangible assets |  | $ 185.5 |
Customer [Member] | 2018 Acquisition [Member] |  |  |
Weighted average useful life (Year) |  |  | 10 years
Total intangible assets |  |  | $ 20.1
Database [Member] | 2019 Acquisitions [Member] |  |  |
Weighted average useful life (Year) |  | 10 years |
Total intangible assets |  | $ 20.7 |

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- 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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- 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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