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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 05, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Amortization of above and below Market Leases						$ 131,000	$ 826,000
Amortization of Intangible Assets, Total						413,000	569,000
Impairment of Real Estate		$ 845,674		$ 845,674		0	532,951
Impairment of Intangible Assets, Finite-lived						274,000	415,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)						0	0
Depreciation, Total						7,400,000	9,100,000
Cash, Uninsured Amount						8,600,000
Restricted Cash, Total		2,700,000		2,700,000		4,700,000
Accounts Receivable, Allowance for Credit Loss, Ending Balance						21,000	60,000
Deferred Costs, Total						2,054,000	2,097,000
Amortization of Deferred Leasing Fees						646,000	510,000
Debt Issuance Costs, Net, Total		$ 500,000		500,000
Amortization of Debt Issuance Costs				$ 733,024	$ 400,131	$ 965,239	$ 675,087
Percentage of Distributed Taxable Income to Qualify as REIT				90.00%		90.00%
Earnings Per Share, Basic and Diluted, Total (in dollars per share)		$ (0.22)	$ (0.14)	$ (0.34)	$ (0.34)	$ (0.07)	$ 0.38
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)						373,259	366,972
Operating Lease, Right-of-Use Asset						$ 661,000
Operating Lease Liability, Gross						661,000
Centennial Tech Center [Member] | Subsequent Event [Member]
Proceeds from Sale of Real Estate, Total	$ 15,000,000
Gain (Loss) on Sale of Properties	$ 4,300,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total						3,900,000
Polar Multi-Strategy Master Fund [Member]
Debt Issuance Costs, Net, Total						748,000
Amortization of Debt Issuance Costs				$ 280,000		373,000
Mortgage Payable [Member]
Amortization of Debt Issuance Costs						470,000	$ 529,000
Series B Preferred Stock [Member]
Unamortized Deferred Stock Costs						0	122,000
Series B Preferred Stock [Member] | Mortgage Payable [Member]
Amortization of Debt Issuance Costs						122,000	147,000
Mortgage Notes [Member]
Debt Issuance Costs, Net, Total						1,066,000	$ 1,427,000
Notes Payable to Banks [Member] | Polar Multi-Strategy Master Fund [Member]
Unamortized Deferred Stock Costs						748,000
Amortization of Debt Issuance Costs						$ 373,000
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
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

X

- Definition

The period of amortization of the value of in-place leases.

+ References

No definition available.

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Present value of lessee's discounted obligation for lease payments gross from operating lease.

+ References

No definition available.

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X

- Definition

Represents the percentage of distributed taxable income to qualify as REIT.

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No definition available.

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The amount of unamortized deferred stock costs.

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Amount of allowance for credit loss on accounts receivable.

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Amount of non-cash amortization of intangible asset (liability) for above and below market leases.

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This element represents the amortization of deferred leasing fees incurred by the lessor and amortized over the term of the lease. Such fees represent (a) costs to originate a lease incurred in transactions with independent third parties that (i) result directly from and are essential to acquire that lease and (ii) would not have been incurred had that leasing transaction not occurred and (b) certain costs directly related to specified activities performed by the lessor for that lease. Those activities are: evaluating the prospective lessee's financial condition; evaluating and recording guarantees, collateral, and other security arrangements; negotiating lease terms; preparing and processing lease documents; and closing the transaction.

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Amount of amortization expense attributable to debt issuance costs.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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The carrying amount of deferred costs.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Useful life on which depreciation was computed for entities with a substantial portion of business acquiring and holding investment real estate, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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