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Note 8 - Intangible Assets - Acquired Intangible Assets (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
Amount | $ 377,622
Estimated weighted average amortization period (Year) | 12 years
Customer Lists and Relationships [Member] |
Amount | $ 90,668
Estimated weighted average amortization period (Year) | 9 years 328 days
Investment Management Contracts [Member] |
Amount | $ 270,600
Estimated weighted average amortization period (Year) | 12 years 328 days
Trademarks and Trade Names [Member] |
Amount | $ 11,632
Estimated weighted average amortization period (Year) | 10 years 328 days
Brokerage Backlog [Member] |
Amount | $ 4,722
Estimated weighted average amortization period (Year) | 182 days

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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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Period Type: | duration

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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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- Details
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- Details
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- Details
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- Details
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