Note 3 - Real Estate - Summary of Geographic Concentration of Properties (Details) $ in Thousands	3 Months Ended
Mar. 31, 2023 USD ($) Property	Mar. 31, 2022 USD ($)
Concentration Risk [Line Items]
Number of Properties \| Property	17
Gross Real Estate Assets	$ 411,700
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	17
Gross Real Estate Assets	$ 411,716
Percentage of Total Real Estate Assets	100.00%
Geographic Concentration Risk [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 10,208	$ 6,727
Geographic Concentration Risk [Member] \| Maryland [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	6
Gross Real Estate Assets	$ 100,467
Percentage of Total Real Estate Assets	24.40%
Geographic Concentration Risk [Member] \| Maryland [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 3,150	3,028
Geographic Concentration Risk [Member] \| Virginia [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	6
Gross Real Estate Assets	$ 211,053
Percentage of Total Real Estate Assets	51.40%
Geographic Concentration Risk [Member] \| Virginia [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 4,222	1,757
Geographic Concentration Risk [Member] \| Pennsylvania [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	1
Gross Real Estate Assets	$ 27,786
Percentage of Total Real Estate Assets	6.70%
Geographic Concentration Risk [Member] \| Pennsylvania [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 683	475
Geographic Concentration Risk [Member] \| Washington, D.C. [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	1
Gross Real Estate Assets	$ 8,422
Percentage of Total Real Estate Assets	2.00%
Geographic Concentration Risk [Member] \| Washington, D.C. [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 182	134
Geographic Concentration Risk [Member] \| Colorado [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	3
Gross Real Estate Assets	$ 63,988
Percentage of Total Real Estate Assets	15.50%
Geographic Concentration Risk [Member] \| Colorado [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 1,971	$ 1,333

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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