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Note 2 - Significant Accounting Policies (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Amortization of above and below Market Leases |  |  |  | $ 18,000 | $ 120,000
Impairment of Real Estate |  |  |  | 608,000 | 1,730,851
Real Estate Investment Property and Lease Intangibles, Net |  | $ 138,064,936 |  | 138,064,936 | 166,253,967
Goodwill and Intangible Asset Impairment, Total |  |  |  | 0 | 0
Depreciation, Depletion and Amortization, Nonproduction, Total |  |  |  | 5,397,498 | 6,274,321
Cash, Uninsured Amount |  | 7,300,000 |  | 7,300,000 |
Restricted Cash, Total |  | 4,700,000 |  | 4,700,000 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance |  | 70,000 |  | 70,000 | 70,000
Deferred Costs, Total |  | 1,400,000 |  | 1,400,000 | 1,900,000
Operating Lease, Initial Direct Cost Expense, over Term |  |  |  | 300,000 | 400,000
Amortization of Debt Issuance Costs |  |  |  | 479,853 | 1,287,430
Deferred Offering Costs |  | 100,000 |  | 100,000 | 100,000
Noninterest Expense Offering Cost |  |  |  | $ (0) | 530,639
Percentage of Distributed Taxable Income to Qualify as REIT |  |  |  | 90.00% |
Marketable Securities, Total |  | 1,514,483 |  | $ 1,514,483 | 83,000
Marketable Securities, Cost Basis |  | 1,600,000 |  | 1,600,000 | 100,000
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  | 0 |  | $ 0 | $ 0
Earnings Per Share, Basic and Diluted, Total (in dollars per share) |  |  |  | $ (0.46) | $ (0.85)
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Marketable Securities, Total |  | 1,500,000 |  | $ 1,500,000 | $ 100,000
Domestic Tax Authority [Member] |  |  |  |  |
Operating Loss Carryforwards, Total |  | 18,000,000.0 |  | 18,000,000.0 |
Polar Multi-Strategy Master Fund [Member] | Notes Payable to Banks [Member] |  |  |  |  |
Debt Issuance Costs, Net, Total |  | 0 |  | 0 | 200,000
Amortization of Debt Issuance Costs |  |  |  | $ 200,000 | 900,000
Building and Building Improvements [Member] |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation (Year) |  |  |  | 39 years |
Waterman Plaza [Member] |  |  |  |  |
Impairment of Real Estate |  |  |  |  | 1,300,000
Real Estate Investment Property and Lease Intangibles, Net | [1] | 0 |  | $ 0 | 3,500,002
Highland Court [Member] |  |  |  |  |
Impairment of Real Estate |  |  | $ 300,000 |  | 400,000
Real Estate Investment Property and Lease Intangibles, Net | [1],[2] | 0 |  | 0 | 10,500,001
Highland Court [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  | 10,200,000
The 300 N.P [Member] |  |  |  |  |
Impairment of Real Estate |  | 300,000 |  |  |
Real Estate Investment Property and Lease Intangibles, Net |  | $ 2,929,563 |  | 2,929,563 | 3,279,522
Lease Intangibles [Member] |  |  |  |  |
Amortization of Intangible Assets, Total |  |  |  | 300,000 | 400,000
Finite-lived Intangibles, Other Than Lease Intangibles [Member] |  |  |  |  |
Amortization of Intangible Assets, Total |  |  |  | $ 200,000 | $ 200,000
Maximum [Member] |  |  |  |  |
Amortization of Value In Place Leases (Year) |  |  |  | 10 years |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation (Year) |  |  |  | 5 years |
Maximum [Member] | Leasehold Improvements [Member] |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation (Year) |  |  |  | 10 years |
Maximum [Member] | Furniture and Fixtures [Member] |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation (Year) |  |  |  | 5 years |
Minimum [Member] |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation (Year) |  |  |  | 1 year |
Minimum [Member] | Leasehold Improvements [Member] |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation (Year) |  |  |  | 1 year |
Minimum [Member] | Furniture and Fixtures [Member] |  |  |  |  |
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation, Life Used for Depreciation (Year) |  |  |  | 4 years |
[1] | This property was sold during the year ended December 31, 2021.
[2] | A portion of the proceeds from the sale of Highland Court were used in like-kind exchange transactions pursued under Section 1031 of the Code for the acquisition of our Mandolin property. Mandolin is owned by NetREIT Palm Self-Storage LP, through its wholly owned subsidiary NetREIT Highland LLC, and the Company is the sole general partner and owns 61.3% of NetREIT Palm Self-Storage LP.

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