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Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Investments in securities [Abstract]    
Investments in securities $ 30,430 $ 25,845
Securities sold, not yet purchased [Abstract]    
Total securities sold, not yet purchased 0 799
Common Stocks [Member]    
Investments in securities [Abstract]    
Investments in securities 19,068 19,099
Open-end Funds [Member]    
Investments in securities [Abstract]    
Investments in securities 5,960 6,128
Actively Managed Semi-transparent EFTs [Member]    
Investments in securities [Abstract]    
Investments in securities 4,890 0
Closed-end Funds [Member]    
Investments in securities [Abstract]    
Investments in securities 512 618
Recurring Basis [Member]    
Assets [Abstract]    
Cash equivalents 118,377 32,661
Investments in securities [Abstract]    
Investments in securities 30,430 25,845
Total assets at fair value 148,807 58,506
Securities sold, not yet purchased [Abstract]    
Trading - Common Stocks   799
Total securities sold, not yet purchased   799
Recurring Basis [Member] | Common Stocks [Member]    
Investments in securities [Abstract]    
Investments in securities 19,068 19,099
Recurring Basis [Member] | Open-end Funds [Member]    
Investments in securities [Abstract]    
Investments in securities 5,960 6,128
Recurring Basis [Member] | Actively Managed Semi-transparent EFTs [Member]    
Investments in securities [Abstract]    
Investments in securities 4,890  
Recurring Basis [Member] | Closed-end Funds [Member]    
Investments in securities [Abstract]    
Investments in securities 512 618
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets [Abstract]    
Cash equivalents 118,377 32,661
Investments in securities [Abstract]    
Investments in securities 30,430 25,845
Total assets at fair value 148,807 58,506
Securities sold, not yet purchased [Abstract]    
Trading - Common Stocks   799
Total securities sold, not yet purchased   799
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Common Stocks [Member]    
Investments in securities [Abstract]    
Investments in securities 19,068 19,099
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Open-end Funds [Member]    
Investments in securities [Abstract]    
Investments in securities 5,960 6,128
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Actively Managed Semi-transparent EFTs [Member]    
Investments in securities [Abstract]    
Investments in securities 4,890  
Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Closed-end Funds [Member]    
Investments in securities [Abstract]    
Investments in securities 512 618
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets [Abstract]    
Cash equivalents 0 0
Investments in securities [Abstract]    
Investments in securities 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
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Common Stocks [Member]    
Investments in securities [Abstract]    
Investments in securities 0 0
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Open-end Funds [Member]    
Investments in securities [Abstract]    
Investments in securities 0 0
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Actively Managed Semi-transparent EFTs [Member]    
Investments in securities [Abstract]    
Investments in securities 0  
Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Closed-end Funds [Member]    
Investments in securities [Abstract]    
Investments in securities 0 0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Assets [Abstract]    
Cash equivalents 0 0
Investments in securities [Abstract]    
Investments in securities 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
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Common Stocks [Member]    
Investments in securities [Abstract]    
Investments in securities 0 0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Open-end Funds [Member]    
Investments in securities [Abstract]    
Investments in securities 0 0
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Actively Managed Semi-transparent EFTs [Member]    
Investments in securities [Abstract]    
Investments in securities 0  
Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Closed-end Funds [Member]    
Investments in securities [Abstract]    
Investments in securities $ 0 $ 0