Notes Payable and Accrued Interest, Components (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Credit Facility [Abstract]
Unamortized debt issuance costs	$ (674,300)	$ (2,216,000)
Special purpose financing [Abstract]
Notes payable and accrued interest	131,092,200	145,598,200
UK LLC SPE Financing [Member]
Special purpose financing [Abstract]
Note obligation	9,211,200	13,511,900
Accrued interest	16,000	23,400
Credit Facility [Member]
Credit Facility [Abstract]
Principal	122,400,000	134,000,000
Unamortized debt issuance costs	(674,300)	(2,216,000)
Special purpose financing [Abstract]
Accrued interest	$ 139,300	$ 278,900