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MORTGAGE NOTES PAYABLE (Details) - USD ($)				12 Months Ended
	Feb. 05, 2020	Jul. 31, 2019	Jul. 01, 2019	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 143,459,048	$ 151,140,916
Unamortized loan costs				(1,066,056)	(1,426,740)
Mortgage notes payable, net				142,392,992	149,714,176
Garden Gateway Plaza
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 6,071,315	6,270,896
Fixed Interest Rate				5.00%
Maturity				Feb. 05, 2020
World Plaza
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 4,979,383	$ 3,350,539
Variable Interest Rate				5.10%
Maturity				Jul. 05, 2020
Description of variable rate basis					LIBOR
Weighted average interest rate				5.04%
World Plaza | ABR
Debt Instrument [Line Items]
Variable interest rate on mortgage (in hundredth)				0.75%
World Plaza | LIBOR
Debt Instrument [Line Items]
Variable interest rate on mortgage (in hundredth)				2.75%
West Fargo Industrial
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 4,216,565	$ 4,292,809
Fixed Interest Rate				4.79%
Maturity				Sep. 06, 2020
Morena Office Center
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 0	1,567,358
Fixed Interest Rate				4.30%
Maturity				Jun. 01, 2021
Waterman Plaza
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 3,274,097	3,369,960
Fixed Interest Rate				5.78%
Maturity				Apr. 29, 2021
300 N.P.
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 2,311,738	2,348,443
Fixed Interest Rate				4.95%
Maturity				Jun. 11, 2022
Highland Court
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 6,424,366	6,568,320
Fixed Interest Rate				3.82%
Maturity				Sep. 01, 2022
Dakota Center
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 10,111,693	10,314,520
Fixed Interest Rate				4.74%
Maturity				Jul. 06, 2024
Union Terrace
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 6,240,396	6,354,153
Fixed Interest Rate				4.50%
Maturity				Sep. 05, 2024
The Presidio
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 0	5,992,905
Fixed Interest Rate				4.54%
Maturity				Dec. 01, 2021
Proceeds from sale of property		$ 12,300,000
Centennial Tech Center
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 9,561,654	9,745,811
Fixed Interest Rate				4.43%
Maturity				Jan. 05, 2024
Centennial Tech Center | Subsequent Event
Debt Instrument [Line Items]
Proceeds from sale of property	$ 15,000,000.0
Research Parkway
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 1,813,305	1,864,139
Fixed Interest Rate				3.94%
Maturity				Jan. 05, 2025
Arapahoe Center
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 8,085,727	8,233,567
Fixed Interest Rate				4.34%
Maturity				Jan. 05, 2025
Union Town Center
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 8,440,000	8,440,000
Fixed Interest Rate				4.28%
Maturity				Jan. 05, 2025
Executive Office Park
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 4,839,576	4,947,808
Fixed Interest Rate				4.83%
Maturity				Jun. 01, 2027
Genesis Plaza
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 6,378,110	6,476,032
Fixed Interest Rate				4.71%
Maturity				Aug. 25, 2025
Proceeds from sale of property			$ 2,900,000
One Park Centre
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 6,487,532	6,585,922
Fixed Interest Rate				4.77%
Maturity				Sep. 05, 2025
Shea Center II
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 17,727,500	17,727,500
Fixed Interest Rate				4.92%
Maturity				Jan. 05, 2026
Grand Pacific Center
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 3,851,962	3,961,304
Fixed Interest Rate				4.02%
Maturity				Aug. 01, 2037
Interest rate terms				Interest rate is subject to reset on September 1, 2023.
Office/Industrial and Retail Properties
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 110,814,919	118,411,986
Model Home Properties
Debt Instrument [Line Items]
Mortgage Notes Payable				$ 32,644,129	$ 32,728,930
Model Home Properties | Minimum
Debt Instrument [Line Items]
Fixed Interest Rate				3.80%
Model Home Properties | Maximum
Debt Instrument [Line Items]
Fixed Interest Rate				5.60%

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