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U.S. Government Securities (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Gross unrealized gains	$ 3,800,000
Gross unrealized losses	0
Carrying Value
Due in 1 year	5,632,000
Due in 1 to 5 years	135,117,000
Total	140,749,000	$ 146,880,000
Fair Value
Due in 1 year	5,684,000
Due in 1 to 5 years	138,905,000
Total	$ 144,589,000

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