Notes Payable and Accrued Interest (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Unamortized debt issuance costs	$ (3,606,200)	$ (3,825,700)
Notes payable and accrued interest	110,957,800	111,638,400
MUFG Credit Facility
Principal	83,333,900	84,084,100
Unamortized debt issuance costs	(2,979,100)	(3,084,200)
Accrued interest	710,700	376,200
Nord Loans
Principal	30,250,600	30,914,500
Unamortized debt issuance costs	(627,000)	(741,500)
Accrued interest	$ 268,700	$ 89,300