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Note 10 - Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Gross carrying amount | $ 647,510 | $ 620,147
Accumulated amortization | 170,056 | 122,217
Net | 477,454 | 497,930
Trademark and Trade Names [Member] |  |
Indefinite life | 23,809 | 23,841
Customer Lists and Relationships [Member] |  |
Gross carrying amount | 310,856 | 290,667
Accumulated amortization | 115,987 | 95,011
Net | 194,869 | 195,656
Investment Management Contracts [Member] |  |
Gross carrying amount | 270,600 | 270,600
Accumulated amortization | 36,434 | 12,145
Net | 234,166 | 258,455
Franchise Rights [Member] |  |
Gross carrying amount | 5,163 | 5,175
Accumulated amortization | 4,505 | 4,141
Net | 658 | 1,034
Trademarks and Trade Names [Member] |  |
Gross carrying amount | 12,435 | 12,851
Accumulated amortization | 2,398 | 2,853
Net | 10,037 | 9,998
Management Contracts and Other [Member] |  |
Gross carrying amount | 16,088 | 16,533
Accumulated amortization | 9,306 | 7,907
Net | 6,782 | 8,626
Brokerage Backlog [Member] |  |
Gross carrying amount | 8,558 | 480
Accumulated amortization | 1,426 | 160
Net | $ 7,132 | $ 320

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