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Related Party Transactions (Details)
 1 Months Ended 3 Months Ended
May 09, 2018
shares
May 31, 2018
a
shares
Aug. 31, 2016
a
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
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       $ 96,500 $ 90,700  
Deferred compensation, employee contribution, percentage       2.00%    
Deferred compensation, company contribution, amount       $ 56,500 $ 46,900  
Deferred compensation, company contribution, percentage       3 3  
Deferred compensation, cumulative unfunded liability       $ 2,800,000   $ 2,700,000
Ancillary costs and expenses       2,200,000 $ 2,000,000  
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses       $ 754,400   $ 933,400
Percentage of annual increase in base rent       3.00%    
Rent expense       $ 193,900 195,100  
Insurance commissions and fees expense       $ 73,400 $ 84,100  
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