Investments in Securities (Tables)
12 Months Ended
Dec. 31, 2021
Investment in Securities [Abstract]  
Investments in Equity Securities
Investments in equity securities at December 31, 2021 and 2020 consisted of the following (in thousands):

 
December 31, 2021
   
December 31, 2020
 
   
Cost
   
Estimated
Fair Value
   
Cost
   
Estimated
Fair Value
 
Investments in equity securities and funds:
                       
Common stocks
 
$
33,575
   
$
16,210
   
$
41,341
   
$
19,099
 
Open-end funds
   
5,722
     
5,995
     
5,757
     
6,128
 
Actively managed semi-transparent ETFs
   
9,000
     
9,599
     
-
     
-
 
Closed-end funds
   
530
     
534
     
628
     
618
 
Other
   
6
     
6
     
-
     
-
 
Total investments in equity securities and funds
 
$
48,833
   
$
32,344
   
$
47,726
   
$
25,845
 
Investments in Debt Securities
Short-term investments in U.S. Treasury Bills at December 31, 2021 and 2020 consisted of the following (in thousands):

 
December 31, 2021
 
   
Amortized
Cost
   
Gross Unrealized
Holding Gains
   
Gross Unrealized
Holding Losses
   
Estimated
Fair Value
 
Short-term investments in U.S. Treasury Bills:
                       
U.S. Treasury Bills
 
$
-
   
$
-
   
$
-
   
$
-
 
Total short-term investments in U.S. Treasury Bills
 
$
-
   
$
-
   
$
-
   
$
-
 

 
December 31, 2020
 
   
Amortized
Cost
   
Gross Unrealized
Holding Gains
   
Gross Unrealized
Holding Losses
   
Estimated
Fair Value
 
Short-term investments in U.S. Treasury Bills:
                       
U.S. Treasury Bills
 
$
64,988
   
$
6
   
$
-
   
$
64,994
 
Total short-term investments in U.S. Treasury Bills
 
$
64,988
   
$
6
   
$
-
   
$
64,994
 
Securities Sold, Not Yet Purchased
Securities sold, not yet purchased at December 31, 2021 and 2020 consisted of the following (in thousands):

 
December 31, 2021
   
December 31, 2020
 
   
Cost
   
Estimated
Fair Value
   
Cost
   
Estimated
Fair Value
 
Investments in equity securities:
                       
Common stocks
 
$
-
   
$
-
   
$
728
   
$
799
 
Total securities sold, not yet purchased
 
$
-
   
$
-
   
$
728
   
$
799