DEFERRED REVENUE - Rent Paid in Advance (Details)			3 Months Ended		9 Months Ended
	Feb. 21, 2018 USD ($)	Oct. 11, 2017	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) item	Sep. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2011
Deferred revenue
Rent payment received					$ 400,000
Lease Payment			$ 807,000		$ 807,000
Number of lease installments | item					4
Period over which rent received in advance is recognized		12 months
Deferred Revenue			6,954,111		$ 6,954,111			$ 2,030,459
Acquisition of Property, Plant, and Equipment and Intangible Lease Assets and Liabilities					29,399,109	$ 49,689,555
Lease Revenue			9,642,000	$ 8,185,000	28,977,000	23,239,000
Master tenant funded incurred related to property acquisition from their leasing reserve escrow	$ 2,250,000		935,000		935,000
Aggregate contributions related to total acquisition cost will be recognized into income property rental revenue over the remaining term of the lease			29,000,000		29,000,000
Oil exploration
Deferred revenue
Lease Payment								$ 10,633,805
Lease Revenue			203,000	$ 603,000	203,000	$ 603,000
Aspen, Colorado
Deferred revenue
Deferred Revenue			2,400,000		2,400,000
Tenant Contributions	1,500,000				1,500,000
Acquisition of Property, Plant, and Equipment and Intangible Lease Assets and Liabilities	$ 28,000,000
Lease Revenue					71,000
Florida
Deferred revenue
Deferred Revenue			$ 1,800,000		1,800,000
Tenant Contributions					1,900,000
Lease Revenue					$ 86,000
Maximum | Oil exploration
Deferred revenue
Lease term			8 years		8 years				8 years
Buc'ees - East of I-95
Deferred revenue
Escrow reserve			$ 831,000		$ 831,000		$ 831,000
Remaining gain to be recognized			$ 831,000		$ 831,000		831,000
Deferred Revenue							$ 25,000