REVENUE RECOGNITION - Timing of Revenue Recognition (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues
Revenue from contract with customer, including assessed tax	$ 6,000	$ 261,000	$ 87,000	$ 496,000
Over lease term	11,309,000	10,597,000	22,225,000	21,517,000
Commercial Loan Investment Related Revenue	835,000	53,000	1,887,000	53,000
Total Revenues	13,009,743	10,688,831	25,848,175	21,648,150
Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax	6,000	20,000	87,000	29,000
Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	859,000	19,000	1,649,000	49,000
Income Properties
Revenues
Over lease term	11,309,000	10,356,000	22,225,000	21,050,000
Total Revenues	11,473,112	10,375,295	22,476,143	21,099,713
Income Properties | Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	164,000	19,000	251,000	49,000
Management Services
Revenues
Total Revenues	695,051		1,397,652
Management Services | Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax	695,000		1,398,000
Interest Income from Commercial Loan Investments
Revenues
Commercial Loan Investment Related Revenue	835,000	53,000	1,887,000	53,000
Total Revenues	835,190	52,765	1,887,239	52,765
Real Estate Operations
Revenues
Over lease term		241,000		467,000
Total Revenues	6,390	260,771	87,141	495,672
Real Estate Operations | Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax	$ 6,000	$ 20,000	$ 87,000	$ 29,000