Fair Value Measurement - Change In Fair Value Measurement Bond Portfolio (Details)	3 Months Ended
	Mar. 31, 2019 USD ($)
Fair Value Disclosures [Abstract]
Balance at Decmeber 31, 2018	$ 15,389,807
Additional Losses on Bond Portfolio	(50,000)
Purchases	895,000
Proceeds	(31,870)
Balance at March 31, 2019	$ 16,202,937