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Related Party Transactions (Details)
1 Months Ended 9 Months Ended
May 09, 2018
shares
May 31, 2018
a
shares
Aug. 31, 2016
a
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
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       $ 264,300 $ 264,900  
Deferred compensation, employee contribution, percentage       2.00%    
Deferred compensation, company contribution, amount       $ 186,300 $ 161,500  
Deferred compensation, company contribution, percentage       3 3  
Deferred compensation, cumulative unfunded liability       $ 3,000,000.0   $ 2,700,000
Ancillary costs and expenses       6,400,000 $ 6,200,000  
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses       $ 810,600   $ 933,400
Percentage of annual increase in base rent       3.00%    
Rent expense       $ 593,500 590,000  
Insurance commissions and fees expense       $ 284,900 $ 251,800  
Ashbrook Marketplace            
Related Party Transaction [Line Items]            
Area of real estate acquired (in acres) | a   13.7        
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 176,680 176,680