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Note 4 - Investments in Securities (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block]
  

December 31, 2023

  

December 31, 2022

 
  

Cost

  

Fair Value

  

Cost

  

Fair Value

 

Debt - Trading Securities:

                

U.S. Treasury Bills

 $88,300  $89,155  $184,636  $186,001 

Equity Securities:

                

Common stocks

  198,269   191,346   221,794   189,977 

Mutual funds

  566   1,186   539   906 

Other investments

  5,166   4,051   6,364   4,702 

Total investments in equity securities

  204,001   196,583   228,697   195,585 

Total investments in securities

 $292,301  $285,738  $413,333  $381,586 
  

December 31, 2023

  

December 31, 2022

 
  

Cost

  

Fair Value

  

Cost

  

Fair Value

 

 

                

Closed-end funds

 $39,680  $53,048  $45,029  $56,772 

Mutual funds

  50,136   73,703   50,224   69,438 

Total investments in affiliated registered investment companies

 $89,816  $126,751  $95,253  $126,210 
Security Sold Short [Table Text Block]
  

December 31, 2023

  

December 31, 2022

 
  

Cost

  

Fair Value

  

Cost

  

Fair Value

 

 

                

Common stocks

 $5,227  $5,035  $2,918  $2,509 

Other investments

  631   883   499   365 

Total securities sold, not yet purchased

 $5,858  $5,918  $3,417  $2,874