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U.S. Government Securities (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Carrying Value
Due in 1 year	$ 130,103,000
TOTAL	130,103,000	$ 135,115,000
Fair Value
Due in 1 year	135,205,000
TOTAL	135,205,000
Gross unrealized gains	5,100,000
Gross unrealized losses	$ 0

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