REVENUE RECOGNITION - Timing of Revenue Recognition (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Over Lease Term									$ 40,911,000	$ 32,278,000	$ 26,384,000
Commercial Loan Investment Related Revenue									616,000	2,053,000	2,588,000
Total Revenues	$ 33,227,164	$ 17,413,926	$ 12,550,267	$ 23,497,243	$ 16,041,186	$ 11,583,182	$ 21,454,270	$ 37,238,340	86,688,600	86,316,978	65,884,467
Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax									43,461,000	50,097,000	14,907,000
Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax									1,701,000	1,889,000	22,006,000
Income Properties
Revenues
Over Lease Term									39,931,000	31,378,000	25,077,000
Total Revenues	11,728,550	9,360,155	9,781,299	9,205,727	8,840,425	7,928,258	7,565,007	7,073,240	40,075,731	31,406,930	25,092,484
Income Properties | Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax									145,000	29,000	16,000
Commercial Loan Investments
Revenues
Commercial Loan Investment Related Revenue									616,000	2,053,000	2,588,000
Total Revenues		41,262	273,467	300,999	325,240	637,801	553,159	536,489	615,728	2,052,689	2,588,235
Real Estate Operations
Revenues
Over Lease Term									980,000	900,000	1,307,000
Total Revenues	$ 21,498,614	$ 8,012,509	$ 2,495,501	$ 13,990,517	$ 6,875,521	$ 3,017,123	$ 13,336,104	$ 29,628,611	45,997,141	52,857,359	38,203,748
Real Estate Operations | Asset/Good Transferred at a Point in Time
Revenues
Revenue from contract with customer, including assessed tax									43,461,000	50,097,000	14,907,000
Real Estate Operations | Services Transferred Over Time
Revenues
Revenue from contract with customer, including assessed tax									$ 1,556,000	$ 1,860,000	$ 21,990,000