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Summary of Significant Accounting Policies (Narrative) (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
item
Summary Of Significant Accounting Policies [Line Items]        
Number of subsidiaries | item       2
Impairment $ 0 $ 0    
Federal tax rate 21.00%      
Net proceeds received from issuance of shares of common stock   $ 96,535    
Operating segments | segment 1      
Cumulative-effect     $ 1,400,000  
Illinois [Member]        
Summary Of Significant Accounting Policies [Line Items]        
Concentration risk 29.60% 33.30%