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U.S. Government Securities (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Gross unrealized gains $ 5,100,000  
Gross unrealized losses 0  
Carrying Value    
Due in 1 year 6,585,000  
Due in 1 to 5 years 127,205,000  
TOTAL 133,790,000 $ 135,115,000
Fair Value    
Due in 1 year 6,702,000  
Due in 1 to 5 years 132,201,000  
TOTAL $ 138,903,000