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U.S. Government Securities (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Gross unrealized gains	$ 7,900,000
Gross unrealized losses	0
Carrying Value
Due in 1 year	4,945,000
Due in 1 to 5 years	134,530,000
U.S Government securities	139,475,000	$ 140,700,000
Fair Value
Due in 1 year	5,028,000
Due in 1 to 5 years	142,389,000
U.S. Government securities	$ 147,417,000

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