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Related Party Transactions (Details)
 1 Months Ended 3 Months Ended
Aug. 31, 2016
USD ($)
a
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
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   $ 90,700 $ 94,400  
Deferred compensation, employee contribution, percentage   2.00%    
Deferred compensation, company contribution, amount   $ 46,900 $ 46,200  
Deferred compensation, company contribution, percentage   3 3  
Deferred compensation, cumulative unfunded liability   $ 2,500,000   $ 2,400,000
Ancillary costs and expenses   2,000,000 $ 1,800,000  
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses   $ 748,400   $ 993,200
Purchases from related party $ 8,800,000      
Area of real estate acquired (in acres) | a 14.3      
Percentage of annual increase in base rent   3.00%    
Rent expense   $ 195,100 188,100  
Insurance commissions and fees expense   $ 84,100 $ 53,200