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Note 29 - Segment and Geographic Information - Balance Sheet Data (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total Assets $ 6,149,379 $ 8,001,624  
Investments in equity method affiliates 13,482 3,799
Goodwill [1] 109 7,992  
Intangible assets (2) [1] 166 166  
Operating Segments [Member]      
Total Assets 6,123,431 7,988,796  
Investments in equity method affiliates 13,482 3,799  
Goodwill [1] 109 7,992  
Intangible assets (2) [1] 166 166  
Segment Reconciling Items [Member]      
Total Assets [2] 25,948 12,828  
Investments in equity method affiliates [2]  
Goodwill [1],[2]  
Intangible assets (2) [1],[2]  
Capital Markets [Member] | Operating Segments [Member]      
Total Assets 6,049,599 7,968,491  
Investments in equity method affiliates  
Goodwill [1] 54 7,937  
Intangible assets (2) [1] 166 166  
Asset Management Segment [Member] | Operating Segments [Member]      
Total Assets 1,540 1,616  
Investments in equity method affiliates  
Goodwill [1] 55 55  
Intangible assets (2) [1]  
Principal Investing [Member] | Operating Segments [Member]      
Total Assets 72,292 18,689  
Investments in equity method affiliates 13,482 3,799  
Goodwill [1]  
Intangible assets (2) [1]  
[1] Goodwill and intangible assets are allocated to the Capital Markets and Asset Management business segments as indicated in the table from above.
[2] Unallocated assets primarily include (1) amounts due from related parties; (2) furniture and equipment, net; and (3) other assets that are not considered necessary for an understanding of business segment assets and such amounts are excluded in business segment reporting to the chief operating decision maker.