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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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