Related Party Transactions (Details)			1 Months Ended	3 Months Ended
	Nov. 05, 2019 USD ($) a $ / shares shares	May 09, 2018 shares	Aug. 31, 2016 a	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, maximum percentage				6.00%
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, amount				$ 120,700	$ 96,500
Deferred compensation, employee contribution, percentage				2.00%
Deferred compensation, company contribution, amount				$ 49,500	$ 56,500
Deferred compensation, company contribution, percentage				3	3
Deferred compensation, cumulative unfunded liability				$ 3,200,000		$ 3,100,000
Ancillary costs and expenses				2,200,000	$ 2,200,000
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses				$ 801,700		$ 918,700
Percentage of annual increase in base rent				3.00%
Rent expense				$ 202,300	193,900
Insurance commissions and fees expense				$ 105,200	$ 73,400
Ashbrook Marketplace | BF Saul Real Estate Investment Trust
Related Party Transaction [Line Items]
Area of real estate acquired (in acres) | a			13.7
Limited partnership units issued for purchase (in shares) | shares		176,680
Land Contributed In Contribution Agreement [Member] | BF Saul Real Estate Investment Trust
Related Party Transaction [Line Items]
Area of land | a	6.8
Leasehold Interest Contributed In Contribution Agreement [Member] | BF Saul Real Estate Investment Trust
Related Party Transaction [Line Items]
Area of land | a	1.3
Contribution Agreement [Member]
Related Party Transaction [Line Items]
Number of partnership units issued in transaction (in shares) | shares	1,416,071
Value of units issued (in dollars per share) | $ / shares	$ 56.00
Value assigned to units issued	$ 79,300,000