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U.S. Government Securities (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Gross unrealized gains	$ 4,200,000
Gross unrealized losses	0
Carrying Value
Due in 1 year	132,222,000
TOTAL	132,222,000	$ 135,115,000
Fair Value
Due in 1 year	136,436,000
TOTAL	$ 136,436,000

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