REVENUE RECOGNITION - Timing of Revenue Recognition (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues
Revenue from contract with customer, including assessed tax	$ 81,000	$ 235,000
Lease revenue	11,003,000	10,724,000
Over Lease Term	10,886,000	10,920,000
Commercial Loan Investment Related Revenue	1,052,000
Total Revenues	12,838,432	10,959,319
Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax	81,000	9,000
Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	819,000	30,000
Income Properties
Revenues
Over Lease Term	10,886,000	10,694,000
Total Revenues	11,003,031	10,724,418
Income Properties | Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	117,000	30,000
Management Fee Income
Revenues
Total Revenues	702,601
Management Fee Income | Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	702,000
Interest Income from Commercial Loan Investments
Revenues
Commercial Loan Investment Related Revenue	1,052,000
Total Revenues	1,052,049
Real Estate Operations
Revenues
Over Lease Term		226,000
Total Revenues	80,751	234,901
Real Estate Operations | Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax	$ 81,000	$ 9,000