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Note 8 - Notes Payable (Details Textual) - USD ($)					1 Months Ended	2 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Jun. 01, 2021	Aug. 17, 2020	Apr. 30, 2020	Apr. 22, 2020	Jan. 31, 2021	May 31, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Sep. 03, 2021	Aug. 17, 2021	Apr. 01, 2021	Sep. 01, 2020	Sep. 17, 2019
Gain (Loss) on Extinguishment of Debt, Total							$ 0		$ 0	$ 10,000	$ 0
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%
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%		4.00%						4.00%
Repayments of Notes Payable, Including Interest												6,300,000
Debt Instrument, Unamortized Discount, Total							$ 0			$ 0		$ 0					$ 1,400,000
Debt Issuance Costs, Gross																	$ 1,100,000

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