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3. Trading Securities (Tables)
12 Months Ended
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of short-term investments

Trading securities for the periods presented were comprised of the following:

 

    Cost     Gross
Unrealized
Gain
    Gross
Unrealized
Loss
    Fair Value  
      (In thousands)  
Security Type                                
December 31, 2020:                                
Trading securities - equity   $ 36,851     $ 74,099     $ (1,847 )   $ 109,103  
                                 
December 31, 2019:                                
Trading securities - debt   $ 93,712     $ 143     $ (12 )   $ 93,843  
Trading securities - equity     17,674       211       (745 )     17,140  
    $ 111,386     $ 354     $ (757 )   $ 110,983