Fair Value (Details) - USD ($)
$ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
| Assets [Abstract] |
|
|
| Cash equivalents |
$ 141,394
|
$ 32,661
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
32,344
|
25,845
|
| Total assets at fair value |
173,738
|
58,506
|
| Securities sold, not yet purchased [Abstract] |
|
|
| Trading - Common Stocks |
|
799
|
| Total securities sold, not yet purchased |
0
|
799
|
| Common Stocks [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
16,210
|
19,099
|
| Actively Managed Semi-transparent EFTs [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
9,599
|
0
|
| Open-end Funds [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
5,995
|
6,128
|
| Closed-end Funds [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
534
|
618
|
| Other [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
6
|
0
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |
|
|
| Assets [Abstract] |
|
|
| Cash equivalents |
141,394
|
32,661
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
32,344
|
25,845
|
| Total assets at fair value |
173,738
|
58,506
|
| Securities sold, not yet purchased [Abstract] |
|
|
| Trading - Common Stocks |
|
799
|
| Total securities sold, not yet purchased |
|
799
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Common Stocks [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
16,210
|
19,099
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Actively Managed Semi-transparent EFTs [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
9,599
|
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Open-end Funds [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
5,995
|
6,128
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Closed-end Funds [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
534
|
618
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
6
|
|
| Significant Other Observable Inputs (Level 2) [Member] |
|
|
| Assets [Abstract] |
|
|
| Cash equivalents |
0
|
0
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
0
|
| Total assets at fair value |
0
|
0
|
| Securities sold, not yet purchased [Abstract] |
|
|
| Trading - Common Stocks |
|
0
|
| Total securities sold, not yet purchased |
|
0
|
| Significant Other Observable Inputs (Level 2) [Member] | Common Stocks [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
0
|
| Significant Other Observable Inputs (Level 2) [Member] | Actively Managed Semi-transparent EFTs [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
|
| Significant Other Observable Inputs (Level 2) [Member] | Open-end Funds [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
0
|
| Significant Other Observable Inputs (Level 2) [Member] | Closed-end Funds [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
0
|
| Significant Other Observable Inputs (Level 2) [Member] | Other [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
|
| Significant Unobservable Inputs (Level 3) [Member] |
|
|
| Assets [Abstract] |
|
|
| Cash equivalents |
0
|
0
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
0
|
| Total assets at fair value |
0
|
0
|
| Securities sold, not yet purchased [Abstract] |
|
|
| Trading - Common Stocks |
|
0
|
| Total securities sold, not yet purchased |
|
0
|
| Significant Unobservable Inputs (Level 3) [Member] | Common Stocks [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
0
|
| Significant Unobservable Inputs (Level 3) [Member] | Actively Managed Semi-transparent EFTs [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
|
| Significant Unobservable Inputs (Level 3) [Member] | Open-end Funds [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
0
|
| Significant Unobservable Inputs (Level 3) [Member] | Closed-end Funds [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
0
|
$ 0
|
| Significant Unobservable Inputs (Level 3) [Member] | Other [Member] |
|
|
| Investments in securities [Abstract] |
|
|
| Investments in equity securities, at fair value |
$ 0
|
|