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Related Party Transactions (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Dec. 08, 2016
Aug. 31, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2012
Dec. 31, 2016
USD ($)
Related Party Transactions [Abstract]            
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     $ 185,500 $ 171,000    
Deferred compensation, employee contribution, percentage     2.00%      
Deferred compensation, company contribution, amount     $ 94,400 $ 78,400    
Deferred compensation, company contribution, percentage     3 3    
Deferred compensation, cumulative unfunded liability     $ 2,200,000     $ 2,100,000
Ancillary costs and expenses     4,200,000 $ 3,700,000    
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses     803,600     $ 860,700
Purchases from related party   $ 8,800,000        
Percentage of annual increase in base rent         3.00%  
Rent expense     379,300 427,800    
Insurance commissions and fees expense     $ 85,700 $ 166,200    
BF Saul Real Estate Investment Trust | Affiliated Entity            
Related Party Transaction [Line Items]            
Automatic renewal period 12 months