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Note 8 - Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Notes Tables |
Schedule of Finite-Lived Intangible Assets [Table Text Block] |
December 31, 2018 |  |  |  |  |  |  |  |  |
|  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net |
Customer lists and relationships |  | $ | 290,667 |  |  | $ | 95,011 |  |  | $ | 195,656 |
Investment management contracts |  |  | 270,600 |  |  |  | 12,145 |  |  |  | 258,455 |
Franchise rights |  |  | 5,175 |  |  |  | 4,141 |  |  |  | 1,034 |
Trademarks and trade names: |  |  |  |  |  |  |  |  |  |  |  |
Indefinite life |  |  | 23,841 |  |  |  | - |  |  |  | 23,841 |
Finite life |  |  | 12,851 |  |  |  | 2,853 |  |  |  | 9,998 |
Management contracts and other |  |  | 16,533 |  |  |  | 7,907 |  |  |  | 8,626 |
Brokerage backlog |  |  | 480 |  |  |  | 160 |  |  |  | 320 |
|  | $ | 620,147 |  |  | $ | 122,217 |  |  | $ | 497,930 |
December 31, 2017 |  |  |  |  |  |  |  |  |
|  | Gross carrying amount |  |  | Accumulated amortization |  |  | Net |
Customer lists and relationships |  | $ | 219,986 |  |  | $ | 74,897 |  |  | $ | 145,089 |
Franchise rights |  |  | 5,703 |  |  |  | 4,156 |  |  |  | 1,547 |
Trademarks and trade names: |  |  |  |  |  |  |  |  |  |  |  |
Indefinite life |  |  | 24,121 |  |  |  | - |  |  |  | 24,121 |
Finite life |  |  | 2,776 |  |  |  | 1,865 |  |  |  | 911 |
Management contracts and other |  |  | 17,733 |  |  |  | 6,572 |  |  |  | 11,161 |
Brokerage backlog |  |  | 310 |  |  |  | 103 |  |  |  | 207 |
|  | $ | 270,629 |  |  | $ | 87,593 |  |  | $ | 183,036 |
Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] |
|  | Amount |  |  | Estimated weighted average amortization period (years) |
Customer lists and relationships |  | $ | 90,668 |  |  |  | 9.9 |
Investment management contracts |  |  | 270,600 |  |  |  | 12.9 |
Trademarks and trade names - finite life |  |  | 11,632 |  |  |  | 10.9 |
Brokerage backlog |  |  | 4,722 |  |  |  | 0.5 |
|  | $ | 377,622 |  |  |  | 12.0 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] |
| 2019 |  | $ | 56,903 |  |
| 2020 |  |  | 53,419 |  |
| 2021 |  |  | 51,366 |  |
| 2022 |  |  | 50,690 |  |
| 2023 |  |  | 48,127 |  |

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