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Note 8 - Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Gross carrying amount | $ 620,147 | $ 270,629
Accumulated amortization | 122,217 | 87,593
Net | 497,930 | 183,036
Trademark and Trade Names [Member] |  |
Indefinite life | 23,841 | 24,121
Indefinite life | 23,841 | 24,121
Customer Lists and Relationships [Member] |  |
Gross carrying amount | 290,667 | 219,986
Accumulated amortization | 95,011 | 74,897
Net | 195,656 | 145,089
Investment Management Contracts [Member] |  |
Gross carrying amount | 270,600 |
Accumulated amortization | 12,145 |
Net | 258,455 |
Franchise Rights [Member] |  |
Gross carrying amount | 5,175 | 5,703
Accumulated amortization | 4,141 | 4,156
Net | 1,034 | 1,547
Trademarks and Trade Names [Member] |  |
Gross carrying amount | 12,851 | 2,776
Accumulated amortization | 2,853 | 1,865
Net | 9,998 | 911
Management Contracts and Other [Member] |  |
Gross carrying amount | 16,533 | 17,733
Accumulated amortization | 7,907 | 6,572
Net | 8,626 | 11,161
Brokerage Backlog [Member] |  |
Gross carrying amount | 480 | 310
Accumulated amortization | 160 | 103
Net | $ 320 | $ 207

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