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The following table presents additional information about marketable equity securities: (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]        
Sales of marketable equity securities     $ (430,000) $ (110,000)
Realized gains on marketable equity securities 397,000
Unrealized gains on marketable equity securities (1,915,000) $ 337,000 45,000 $ (29,000)
Common Stock [Member]        
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]        
Balance at January 1, 2021     2,563,000  
Purchases of marketable equity securities in operations     270,742,000  
Conversion of debt securities to marketable securities     2,656,000  
Sales of marketable equity securities in operations     (251,126,000)  
Sales of marketable equity securities     (430,000)  
Realized gains on marketable equity securities     12,283,000  
Unrealized gains on marketable equity securities     3,484,000  
Balance at June 30, 2021 $ 30,172,000   $ 30,172,000