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ORGANIZATION (Details Narrative) |  |  |  |  |  | 9 Months Ended | 12 Months Ended |  |  |  |  |  |
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Jul. 12, 2021 $ / shares shares | Jun. 17, 2021 USD ($) shares | Jun. 15, 2021 USD ($) $ / shares shares | Oct. 06, 2020 USD ($) $ / shares | Jul. 29, 2020 | Sep. 30, 2021 USD ($) Integer $ / shares | Sep. 30, 2020 USD ($) | Oct. 06, 2021 USD ($) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2016 Integer | Aug. 31, 2021 $ / shares shares | Apr. 27, 2021 USD ($) | Jul. 12, 2020 $ / shares | Jul. 10, 2020 $ / shares | Jun. 10, 2020 $ / shares | Jan. 23, 2012 $ / shares
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Limited Liability Companies | Integer |  |  |  |  |  | 2 |  |  |  |  | 4 |  |  |  |  |  |
Number of Limited Partnerships in which Company is Sole General Partner | Integer |  |  |  |  |  | 6 |  |  |  |  | 1 |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10.00
Issuance of common stock series A, net of offering costs |  |  |  |  |  | $ 8,871,879 |  |  | $ 205,000,000,000 |  |  |  |  |  |  |  |
Equity offering, maximum gross proceeds |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |
Issuance of preferred stock series D, net of offering costs |  |  |  |  |  | 20,489,803 |  |  |  |  |  |  |  |  |  |  |
Long-term debt, maturity, remainder of fiscal year |  |  |  |  |  |  | $ 942,863 |  |  |  |  |  |  |  |  |  |
Mortgage Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, maturity, remainder of fiscal year |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |
Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, Number of securities called by warrants or rights (in shares) | shares | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, exercised during period (in shares) | $ / shares | $ 0.01 |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.01 |  |  |
Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, Number of securities called by warrants or rights (in shares) | shares | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, exercised during period (in shares) | $ / shares | $ 5.50 |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.50 |  |  |
Warrants and rights outstanding, term (Year) | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Placement Agent Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, Number of securities called by warrants or rights (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 80,000 |  |  |  |  |
Class of warrant or right, exercised during period (in shares) | $ / shares |  |  |  |  |  | $ 0 |  |  |  |  |  | $ 6.25 |  |  |  |  |
Class of warrant or right, securities called by warrants or rights, percentage of class of stock |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |
Warrants and rights outstanding, term (Year) |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |
Class A Common Stock and Accompanying Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares | $ 5.00 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.00 |  |
Class A Common Stock and Accompanying Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares | $ 4.99 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4.99 |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock, net of issuance cost (in shares) | shares | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, Number of securities called by warrants or rights (in shares) | shares | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pre-funded Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of warrant or right, Number of securities called by warrants or rights (in shares) | shares | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock, net of issuance cost (in shares) | shares |  | 920,000 | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  |  | $ 25.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  | 9.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred stock series D, net of offering costs |  | $ 20,500,000 | $ 18,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock, net of issuance cost (in shares) | shares |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  |  |  | $ 5.00 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock series A, net of offering costs |  |  |  | $ 2,000,000.0 |  |  |  | $ 2,000,000.0 |  |  |  |  |  |  |  |  |
IPO [Member] | Other Expenses [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
IPO [Member] | Underwriting Discounts [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs |  |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of stock, net of issuance cost (in shares) | shares |  | 120,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of preferred stock series D, net of offering costs |  | $ 2,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option to purchase additional shares, period (Day) |  | 45 days | 45 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse Stock Split [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Commercial Property [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties, Fee Simple | Integer |  |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  |  |
Commercial Property [Member] | Partially Owned Properties [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Real Estate Properties, Fee Simple | Integer |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Model Home [Member] | Mortgage Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, maturity, remainder of fiscal year |  |  |  |  |  | $ 600,000 |  |  | $ 10,200,000 |  |  |  |  |  |  |  |

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