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REAL ESTATE ASSETS (Geographic Locations of Real Estate Properties Owned) (Details)	6 Months Ended
	Jun. 30, 2020 USD ($) ft² property
Commercial Property
Real Estate Properties [Line Items]
Number of properties \| property	15
Aggregate Square Feet \| ft²	1,129,738
Approximate % of Square Feet	100.00%
Current Base Annual Rent \| $	$ 14,474,671
Approximate of Aggregate % Annual Rent	100.00%
California \| Commercial Property
Real Estate Properties [Line Items]
Number of properties \| property	3
Aggregate Square Feet \| ft²	134,787
Approximate % of Square Feet	11.90%
Current Base Annual Rent \| $	$ 1,901,873
Approximate of Aggregate % Annual Rent	13.20%
Colorado \| Commercial Property
Real Estate Properties [Line Items]
Number of properties \| property	8
Aggregate Square Feet \| ft²	597,912
Approximate % of Square Feet	52.90%
Current Base Annual Rent \| $	$ 9,120,615
Approximate of Aggregate % Annual Rent	63.00%
North Dakota \| Commercial Property
Real Estate Properties [Line Items]
Number of properties \| property	4
Aggregate Square Feet \| ft²	397,039
Approximate % of Square Feet	35.20%
Current Base Annual Rent \| $	$ 3,452,183
Approximate of Aggregate % Annual Rent	23.80%
Model Home Properties
Real Estate Properties [Line Items]
Number of properties \| property	132
Aggregate Square Feet \| ft²	374,926
Approximate % of Square Feet	100.00%
Current Base Annual Rent \| $	$ 3,958,128
Approximate of Aggregate % Annual Rent	100.00%
Model Home Properties \| Southwest
Real Estate Properties [Line Items]
Number of properties \| property	105
Aggregate Square Feet \| ft²	308,071
Approximate % of Square Feet	82.20%
Current Base Annual Rent \| $	$ 3,116,028
Approximate of Aggregate % Annual Rent	78.70%
Model Home Properties \| Southeast
Real Estate Properties [Line Items]
Number of properties \| property	20
Aggregate Square Feet \| ft²	45,727
Approximate % of Square Feet	12.20%
Current Base Annual Rent \| $	$ 551,088
Approximate of Aggregate % Annual Rent	13.90%
Model Home Properties \| Midwest
Real Estate Properties [Line Items]
Number of properties \| property	2
Aggregate Square Feet \| ft²	6,602
Approximate % of Square Feet	1.70%
Current Base Annual Rent \| $	$ 99,276
Approximate of Aggregate % Annual Rent	2.50%
Model Home Properties \| East
Real Estate Properties [Line Items]
Number of properties \| property	2
Aggregate Square Feet \| ft²	5,255
Approximate % of Square Feet	1.40%
Current Base Annual Rent \| $	$ 70,716
Approximate of Aggregate % Annual Rent	1.80%
Model Home Properties \| Northeast
Real Estate Properties [Line Items]
Number of properties \| property	3
Aggregate Square Feet \| ft²	9,271
Approximate % of Square Feet	2.50%
Current Base Annual Rent \| $	$ 121,020
Approximate of Aggregate % Annual Rent	3.10%