REVENUE RECOGNITION - Timing of Revenue Recognition (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues
Revenue from contract with customer, including assessed tax				$ 16,485,000
Over Lease Term	$ 10,597,000	$ 9,948,000	$ 21,517,000	19,336,000
Commercial Loan Investment Related Revenue	53,000	274,000	53,000	575,000
Total Revenues	17,938,831	12,550,267	32,198,150	36,047,510
Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax	7,270,000	2,283,000	10,579,000	16,063,000
Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	19,000	45,000	49,000	73,000
Income Properties
Revenues
Over Lease Term	10,356,000	9,736,000	21,050,000	18,914,000
Total Revenues	10,375,295	9,781,299	21,099,713	18,987,026
Income Properties | Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	19,000	45,000	49,000	73,000
Commercial Loan Investments
Revenues
Commercial Loan Investment Related Revenue	53,000	274,000	53,000	575,000
Total Revenues	52,765	273,467	52,765	574,466
Real Estate Operations
Revenues
Revenue from contract with customer, including assessed tax	7,511,000	2,495,000	11,046,000
Over Lease Term	241,000	212,000	467,000	422,000
Total Revenues	7,510,771	2,495,501	11,045,672	16,486,018
Real Estate Operations | Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax	$ 7,270,000	$ 2,283,000	$ 10,579,000	$ 16,063,000