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U.S. Government Securities (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Gross unrealized gains	$ 7,600,000
Gross unrealized losses	0
Carrying Value
Due in 1 year	6,522,000
Due in 1 to 5 years	130,127,000
TOTAL	136,649,000	$ 140,700,000
Fair Value
Due in 1 year	7,385,000
Due in 1 to 5 years	136,885,000
TOTAL	$ 144,270,000

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