Fair Value Measurement - Fair Value Bond Portfolio (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Gross Bond portfolio	$ 17,619,937	$ 16,055,937	$ 17,619,937	$ 16,055,937
Fair Value Measurement Level 3
Gross Bond portfolio	$ 17,619,937	$ 16,055,937