Note 11- Concentrations of Credit Risks - Summary of Geographic Concentration of Properties (Details) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) property
Concentration Risk [Line Items]
Number of Properties \| property	10
Total Gross Real Estate Assets	$ 173,544
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Number of Properties \| property	10
Total Gross Real Estate Assets	$ 173,544
Percentage of Total Real Estate Property Investments	100.00%
Geographic Concentration Risk [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 242
Geographic Concentration Risk [Member] \| Maryland [Member]
Concentration Risk [Line Items]
Number of Properties \| property	4
Total Gross Real Estate Assets	$ 71,507
Percentage of Total Real Estate Property Investments	41.20%
Geographic Concentration Risk [Member] \| Maryland [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 131
Geographic Concentration Risk [Member] \| Virginia [Member]
Concentration Risk [Line Items]
Number of Properties \| property	4
Total Gross Real Estate Assets	$ 67,120
Percentage of Total Real Estate Property Investments	38.70%
Geographic Concentration Risk [Member] \| Virginia [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 65
Geographic Concentration Risk [Member] \| Pennsylvania [Member]
Concentration Risk [Line Items]
Number of Properties \| property	1
Total Gross Real Estate Assets	$ 26,534
Percentage of Total Real Estate Property Investments	15.30%
Geographic Concentration Risk [Member] \| Pennsylvania [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 37
Geographic Concentration Risk [Member] \| Washington, D.C. [Member]
Concentration Risk [Line Items]
Number of Properties \| property	1
Total Gross Real Estate Assets	$ 8,383
Percentage of Total Real Estate Property Investments	4.80%
Geographic Concentration Risk [Member] \| Washington, D.C. [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 9

Percentage of real estate property investment.

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+ References

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The number of real estate properties owned as of the balance sheet date.

+ References

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Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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