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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, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
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       $ 264,900 $ 270,600  
Deferred compensation, employee contribution, percentage       2.00%    
Deferred compensation, company contribution, amount       $ 161,500 $ 154,300  
Deferred compensation, company contribution, percentage       3 3  
Deferred compensation, cumulative unfunded liability       $ 2,600,000   $ 2,400,000
Ancillary costs and expenses       6,200,000 $ 5,400,000  
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses       $ 767,600   $ 993,200
Percentage of annual increase in base rent       3.00%    
Rent expense       $ 590,000 578,200  
Insurance commissions and fees expense       $ 251,800 $ 173,800  
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