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Unsecured Lines of Credit - Additional Information (Details) - USD ($)
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Line Of Credit Facility [Line Items]      
Lines of credit   $ 28,465,600 $ 50,000,000
Operating [Member]      
Line Of Credit Facility [Line Items]      
Lines of credit   $ 0  
Operating [Member] | Scenario, Forecast [Member]      
Line Of Credit Facility [Line Items]      
Lines of credit $ 0