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Long-Term Debt And Lease Liabilities (Narrative) (Details)
1 Months Ended 9 Months Ended
Jul. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Borrowing rate   6.00%  
Office [Member]      
Debt Instrument [Line Items]      
Term of contract   39 months  
Lease renewal term   36 months  
Prosperity Bank [Member]      
Debt Instrument [Line Items]      
Rate above prime 0.50%    
Interest rate 6.00% 5.50%  
Credit facility maximum borrowing capacity $ 3,800,000    
Credit facility current borrowing capacity $ 4,000,000 $ 4,000,000  
Credit facility amount outstanding   0 $ 0
Credit limit   3,800,000  
Prosperity Bank [Member] | Loans And Letters Of Credit [Member]      
Debt Instrument [Line Items]      
Credit facility maximum borrowing capacity   $ 50,000,000  
Maximum [Member]      
Debt Instrument [Line Items]      
Borrowing rate   6.50%  
Maximum [Member] | Vehicles [Member]      
Debt Instrument [Line Items]      
Term of contract   36 months  
Discount rate   6.50%  
Maximum [Member] | Prosperity Bank [Member]      
Debt Instrument [Line Items]      
Funded debt to EBITDA   3.5  
Minimum [Member]      
Debt Instrument [Line Items]      
Borrowing rate   5.00%  
Minimum [Member] | Vehicles [Member]      
Debt Instrument [Line Items]      
Term of contract   18 months  
Discount rate   5.00%  
Minimum [Member] | Prosperity Bank [Member]      
Debt Instrument [Line Items]      
Current ratio   1  
Interest coverage   3.0