Note 3 - Real Estate - Summary of Geographic Concentration of Properties (Details)	3 Months Ended
Mar. 31, 2020 USD ($) property	Mar. 31, 2019 USD ($)
Concentration Risk [Line Items]
Number of Properties \| property	10
Gross Real Estate Assets	$ 176,000,000
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Number of Properties \| property	10
Gross Real Estate Assets	$ 176,047,000
Percentage of Total Real Estate Assets	100.00%
Geographic Concentration Risk [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 4,146,000	$ 0
Geographic Concentration Risk [Member] \| Maryland [Member]
Concentration Risk [Line Items]
Number of Properties \| property	4
Gross Real Estate Assets	$ 73,845,000
Percentage of Total Real Estate Assets	42.00%
Geographic Concentration Risk [Member] \| Maryland [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 2,154,000
Geographic Concentration Risk [Member] \| Virginia [Member]
Concentration Risk [Line Items]
Number of Properties \| property	4
Gross Real Estate Assets	$ 67,150,000
Percentage of Total Real Estate Assets	38.10%
Geographic Concentration Risk [Member] \| Virginia [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 1,228,000
Geographic Concentration Risk [Member] \| Pennsylvania [Member]
Concentration Risk [Line Items]
Number of Properties	1
Gross Real Estate Assets	$ 26,659,000
Percentage of Total Real Estate Assets	15.10%
Geographic Concentration Risk [Member] \| Pennsylvania [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 594,000
Geographic Concentration Risk [Member] \| Washington, D.C. [Member]
Concentration Risk [Line Items]
Number of Properties \| property	1
Gross Real Estate Assets	$ 8,393,000
Percentage of Total Real Estate Assets	4.80%
Geographic Concentration Risk [Member] \| Washington, D.C. [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 170,000

Percentage of real estate property investment.

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

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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.

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