DEFERRED REVENUE - Rent Paid in Advance (Details) - USD ($)			3 Months Ended
	Feb. 21, 2018	Oct. 11, 2017	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Sep. 20, 2017	Dec. 31, 2011
Deferred revenue
Lease Revenue			$ 10,920,000	$ 9,389,000
Period over which rent received in advance is recognized		12 months
Deferred Revenue			6,622,253		$ 7,201,604
Acquisition of Property, Plant, and Equipment and Intangible Lease Assets and Liabilities			188,112	27,916,784
Master tenant funded incurred related to property acquisition from their leasing reserve escrow			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
Oil exploration
Deferred revenue
Lease Revenue			199,000	199,000
Lease Payment			10,633,805
Aspen, Colorado
Deferred revenue
Lease Revenue			132,000
Deferred Revenue			2,300,000
Tenant Contributions	$ 1,500,000		1,500,000
Acquisition of Property, Plant, and Equipment and Intangible Lease Assets and Liabilities	$ 28,000,000
Florida
Deferred revenue
Lease Revenue			149,000
Deferred Revenue			1,700,000
Tenant Contributions			$ 1,900,000
Maximum | Oil exploration
Deferred revenue
Lease term			8 years			13 years	8 years
Lease Payment			$ 807,000
Buc'ees - East of I-95
Deferred revenue
Escrow reserve				831,000
Remaining gain to be recognized				831,000
Deferred Revenue				$ 25,000