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Note 11 - Goodwill - Components of Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Balance | $ 1,088,984 | $ 949,221
Goodwill acquired during the year | 22,491 | 117,984
Other items | 2 | 150
Foreign exchange | (20,429) | 21,629
Balance | 1,091,048 | 1,088,984
Goodwill | 1,120,631 |
Accumulated impairment loss | (29,583) |
Goodwill, Ending Balance | 1,091,048 | 1,088,984
Investment Management [Member] |  |
Balance | 380,292 | 379,151
Goodwill acquired during the year | 0 | 0
Other items | 0 | 0
Foreign exchange | (971) | 1,141
Balance | 379,321 | 380,292
Goodwill | 379,321 |
Accumulated impairment loss | 0 |
Goodwill, Ending Balance | 379,321 | 380,292
Americas [Member] |  |
Balance | 337,727 | 220,410
Goodwill acquired during the year | 22,491 | 117,984
Other items | 2 | 0
Foreign exchange | (275) | (667)
Balance | 359,945 | 337,727
Goodwill | 386,216 |
Accumulated impairment loss | (26,271) |
Goodwill, Ending Balance | 359,945 | 337,727
EMEA [Member] |  |
Balance | 275,546 | 257,333
Goodwill acquired during the year | 0 | 0
Other items | 0 | 0
Foreign exchange | (15,782) | 18,213
Balance | 259,764 | 275,546
Goodwill | 263,076 |
Accumulated impairment loss | (3,312) |
Goodwill, Ending Balance | 259,764 | 275,546
Asia Pacific [Member] |  |
Balance | 95,419 | 92,327
Goodwill acquired during the year | 0 | 0
Other items | 0 | 150
Foreign exchange | (3,401) | 2,942
Balance | 92,018 | 95,419
Goodwill | 92,018 |
Accumulated impairment loss | 0 |
Goodwill, Ending Balance | $ 92,018 | $ 95,419

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