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MORTGAGE NOTES PAYABLE (Detail) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 05, 2020 | Jul. 31, 2019 | Jul. 01, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 128,002,720 | $ 143,459,048 | $ 151,140,916
Unamortized loan costs |  |  |  | (879,175) | (1,066,056) | (1,426,740)
Mortgage notes payable, total net |  |  |  | 127,123,545 | 142,392,992 | 149,714,176
Garden Gateway Plaza |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 6,019,844 | $ 6,071,315 | 6,270,896
Fixed interest rate on mortgage |  |  |  | 5.00% | 5.00% |
Maturity |  |  |  | Aug. 05, 2021 | Feb. 05, 2020 |
World Plaza |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 4,953,556 | $ 4,979,383 | 3,350,539
Maturity |  |  |  | Jul. 05, 2020 | Jul. 05, 2020 |
Variable Interest Rate |  |  |  | 4.41% | 5.10% |
Description of variable rate basis |  |  |  |  | LIBOR |
Weighted average interest rate |  |  |  | 4.41% | 5.04% |
World Plaza | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest rate on mortgage |  |  |  | 2.75% | 2.75% |
World Plaza | ABR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest rate on mortgage |  |  |  | 0.75% | 0.75% |
West Fargo Industrial |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 4,196,788 | $ 4,216,565 | 4,292,809
Fixed interest rate on mortgage |  |  |  | 4.79% | 4.79% |
Maturity |  |  |  | Sep. 06, 2020 | Sep. 06, 2020 |
Morena Office Center |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  |  |  | 1,567,358
Fixed interest rate on mortgage |  |  |  |  | 4.30% |
Maturity |  |  |  |  | Jun. 01, 2021 |
Waterman Plaza |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 3,254,223 | $ 3,274,097 | 3,369,960
Fixed interest rate on mortgage |  |  |  | 5.78% | 5.78% |
Maturity |  |  |  | Apr. 29, 2021 | Apr. 29, 2021 |
300 N.P. |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 2,302,197 | $ 2,311,738 | 2,348,443
Fixed interest rate on mortgage |  |  |  | 4.95% | 4.95% |
Maturity |  |  |  | Jun. 11, 2022 | Jun. 11, 2022 |
Highland Court |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 6,387,511 | $ 6,424,366 | 6,568,320
Fixed interest rate on mortgage |  |  |  | 3.82% | 3.82% |
Maturity |  |  |  | Sep. 01, 2022 | Sep. 01, 2022 |
Dakota Center |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 10,059,135 | $ 10,111,693 | 10,314,520
Fixed interest rate on mortgage |  |  |  | 4.74% | 4.74% |
Maturity |  |  |  | Jul. 06, 2024 | Jul. 06, 2024 |
Union Terrace |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 0 | $ 6,240,396 | 6,354,153
Fixed interest rate on mortgage |  |  |  | 4.50% | 4.50% |
Maturity |  |  |  | Sep. 05, 2024 | Sep. 05, 2024 |
The Presidio |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  |  |  | 5,992,905
Fixed interest rate on mortgage |  |  |  |  | 4.54% |
Maturity |  |  |  |  | Dec. 01, 2021 |
Proceeds from sale of property |  | $ 12,300,000 |  |  |  |
Centennial Tech Center |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 0 | $ 9,561,654 | 9,745,811
Fixed interest rate on mortgage |  |  |  | 4.43% | 4.43% |
Maturity |  |  |  | Jan. 05, 2024 | Jan. 05, 2024 |
Centennial Tech Center | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from sale of property | $ 15,000,000 |  |  |  |  |
Research Parkway |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 1,800,281 | $ 1,813,305 | 1,864,139
Fixed interest rate on mortgage |  |  |  | 3.94% | 3.94% |
Maturity |  |  |  | Jan. 05, 2025 | Jan. 05, 2025 |
Arapahoe Service Center |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 8,047,511 | $ 8,085,727 | 8,233,567
Fixed interest rate on mortgage |  |  |  | 4.34% | 4.34% |
Maturity |  |  |  | Jan. 05, 2025 | Jan. 05, 2025 |
Union Town Center |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 8,416,833 | $ 8,440,000 | 8,440,000
Fixed interest rate on mortgage |  |  |  | 4.28% | 4.28% |
Maturity |  |  |  | Jan. 05, 2025 | Jan. 05, 2025 |
Executive Office Park |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 4,811,730 | $ 4,839,576 | 4,947,808
Fixed interest rate on mortgage |  |  |  | 4.83% | 4.83% |
Maturity |  |  |  | Jun. 01, 2027 | Jun. 01, 2027 |
Genesis Plaza |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 6,352,694 | $ 6,378,110 | 6,476,032
Fixed interest rate on mortgage |  |  |  | 4.71% | 4.71% |
Maturity |  |  |  | Sep. 06, 2025 | Aug. 25, 2025 |
Proceeds from sale of property |  |  | $ 2,900,000 |  |  |
One Park Centre |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 6,461,980 | $ 6,487,532 | 6,585,922
Fixed interest rate on mortgage |  |  |  | 4.77% | 4.77% |
Maturity |  |  |  | Sep. 05, 2025 | Sep. 05, 2025 |
Shea Center II |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 17,727,500 | $ 17,727,500 | 17,727,500
Fixed interest rate on mortgage |  |  |  | 4.92% | 4.92% |
Maturity |  |  |  | Jan. 05, 2026 | Jan. 05, 2026 |
Grand Pacific Center |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 3,823,965 | $ 3,851,962 | 3,961,304
Fixed interest rate on mortgage |  |  |  | 4.02% | 4.02% |
Maturity |  |  |  | Aug. 01, 2037 | Aug. 01, 2037 |
Debt Instrument, 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 |  |  |  | $ 33,386,972 | $ 32,644,129 | $ 32,728,930
Model Home properties | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fixed interest rate on mortgage |  |  |  | 3.44% | 3.80% |
Model Home properties | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fixed interest rate on mortgage |  |  |  | 5.63% | 5.60% |
Presidio Property Trust, Inc. properties |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Mortgage notes payable |  |  |  | $ 94,615,748 | $ 110,814,919 |

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