Note 10 - Concentrations of Credit Risks - Summary of Geographic Concentration of Properties (Details) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($) Property	Dec. 31, 2020 USD ($) Property
Concentration Risk [Line Items]
Number of Properties \| Property	15
Total Gross Real Estate Assets	$ 257,917
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	15	11
Total Gross Real Estate Assets	$ 257,917	$ 185,016
Percentage of Total Gross Real Estate Assets	100.00%	100.00%
Geographic Concentration Risk [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 21,408	$ 15,864
Geographic Concentration Risk [Member] \| Maryland [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	6	4
Total Gross Real Estate Assets	$ 101,608	$ 75,780
Percentage of Total Gross Real Estate Assets	39.40%	40.90%
Geographic Concentration Risk [Member] \| Maryland [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 10,332	$ 7,972
Geographic Concentration Risk [Member] \| Virginia [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	5	4
Total Gross Real Estate Assets	$ 82,909	$ 68,017
Percentage of Total Gross Real Estate Assets	32.10%	36.80%
Geographic Concentration Risk [Member] \| Virginia [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 6,418	$ 4,910
Geographic Concentration Risk [Member] \| Pennsylvania [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	1	1
Total Gross Real Estate Assets	$ 27,628	$ 26,757
Percentage of Total Gross Real Estate Assets	10.70%	14.50%
Geographic Concentration Risk [Member] \| Pennsylvania [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 2,457	$ 2,109
Geographic Concentration Risk [Member] \| Washington, D.C. [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	1	1
Total Gross Real Estate Assets	$ 8,393	$ 8,393
Percentage of Total Gross Real Estate Assets	3.30%	4.50%
Geographic Concentration Risk [Member] \| Washington, D.C. [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 608	$ 691
Geographic Concentration Risk [Member] \| Colorado [Member]
Concentration Risk [Line Items]
Number of Properties \| Property	2	1
Total Gross Real Estate Assets	$ 37,379	$ 6,069
Percentage of Total Gross Real Estate Assets	14.50%	3.30%
Geographic Concentration Risk [Member] \| Colorado [Member] \| Rental Income [Member]
Concentration Risk [Line Items]
Revenues	$ 1,593	$ 182

Percentage of gross real estate assets.

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