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Note 2 - Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Amortization of above and below Market Leases | $ 100,000 | $ 100,000
Amortization of Intangible Assets, Total | 400,000 | 600,000
Impairment of Real Estate | 1,730,851 | 0
Impairment of Intangible Assets, Finite-lived | 200,000 | 300,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 0 | 0
Depreciation, Total | 6,300,000 | 7,400,000
Cash, Uninsured Amount | 9,800,000 |
Restricted Cash, Total | 4,100,000 |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 70,000 | 21,000
Deferred Costs, Total | 1,900,000 | 2,100,000
Operating Lease, Initial Direct Cost Expense, over Term | 400,000 | 600,000
Amortization of Debt Issuance Costs | 1,287,430 | 965,239
Deferred Offering Costs | 100,000 |
Noninterest Expense Offering Cost | $ 530,639 | $ (0)
Percentage of Distributed Taxable Income to Qualify as REIT | 90.00% |
Earnings Per Share, Basic and Diluted, Total (in dollars per share) | $ (0.85) | $ (0.07)
Domestic Tax Authority [Member] |  |
Operating Loss Carryforwards, Total | $ 11,000,000.0 |
Series B Preferred Stock [Member] |  |
Unamortized Deferred Stock Costs |  | $ 100,000
Mortgage Notes [Member] |  |
Debt Issuance Costs, Net, Total | 800,000 | 1,100,000
Amortization of Debt Issuance Costs | 400,000 | 500,000
Notes Payable to Banks [Member] | Polar Multi-Strategy Master Fund [Member] |  |
Debt Issuance Costs, Net, Total | 200,000 |
Amortization of Debt Issuance Costs | $ 900,000 | $ 400,000
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 |
Highland Court [Member] |  |
Impairment of Real Estate | $ 400,000 |
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 |

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