Notes Payable and Accrued Interest (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Unamortized debt issuance costs	$ (1,906,500)	$ (3,825,700)
Notes payable and accrued interest	111,575,400	111,638,400
MUFG Credit Facility
Principal	85,069,100	84,084,100
Unamortized debt issuance costs	(1,558,000)	(3,084,200)
Accrued interest	2,280,000	376,200
Nord Loans
Principal	25,783,000	30,914,500
Unamortized debt issuance costs	(348,500)	(741,500)
Accrued interest	72,400	89,300
Paycheck Protection Program Loan
Principal	276,400	0
Unamortized debt issuance costs	0	0
Accrued interest	$ 1,000	$ 0