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Note 8 - Note Payable (Details Textual) - USD ($) |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 01, 2021 | Aug. 17, 2020 | Apr. 30, 2020 | Apr. 22, 2020 | Jan. 31, 2021 | May 31, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 20, 2021 | Sep. 03, 2021 | Aug. 17, 2021 | Apr. 01, 2021 | Sep. 30, 2020 | Sep. 01, 2020 | Sep. 17, 2019
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  |  |  |  | $ 10,000 | $ 451,785 |  |  |  |  |  |  |
Majority Owned Subsidiary NetREIT Highland [Member] | Promissory Note for the Acquisition of the Mandolin Property in Houston, Texas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 1,560,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |
Majority Owned Subsidiary, PPT Baltimore [Member] | Promissory Note Issued for Acquisition of Baltimore Property in Baltimore, MD [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  | $ 5,650,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  | 4.50% |  |  |  |  |  |
Economic Injury Disaster Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  | $ 150,000 |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Decrease, Forgiveness |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt, Total |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |
Economic Injury Disaster Loan [Member] | Accounts Payable and Accrued Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt, Total |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |
SBA CARES Act Paycheck Protection Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | LGD Investments Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Assumed from Related Party | $ 330,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | Dubose Model Homes Investors #203, PL [Member] | LGD Investments Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 330,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |
Interest Expense, Debt, Total |  |  |  |  |  | $ 2,200 |  |  |  |  |  |  |  |  |  |
Promissory Notes for the Refinancing of Four Model Home Properties in Texas and Wisconsin [Member] | Majority Owned Subsidiary Dubose Model Home Investors 202 LP and 204 LP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  | $ 900,000 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |
Polar Multi-Strategy Master Fund [Member] | Notes Payable to Banks [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,000,000.0
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00%
Long-term Debt, Total |  |  |  |  |  |  |  |  | 7,700,000 |  |  |  |  |  | $ 8,800,000 |
Debt Instrument, Renewal Fee Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |
Repayments of Notes Payable, Including Interest |  |  |  |  |  |  |  |  | 6,300,000 |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount, Total |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  | $ 1,400,000
Debt Issuance Costs, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100,000

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