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U.S. Government Securities (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Gross unrealized gains	$ 5,200,000
Gross unrealized losses	0
Carrying Value
Due in 1 year	5,764,000
Due in 1 to 5 years	129,351,000
TOTAL	135,115,000	$ 140,749,000
Fair Value
Due in 1 year	5,871,000
Due in 1 to 5 years	134,399,000
TOTAL	$ 140,270,000

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