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Debt (Narrative) (Details)
1 Months Ended 12 Months Ended
Mar. 07, 2018
USD ($)
Mar. 02, 2018
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
item
shares
Dec. 31, 2017
USD ($)
Mar. 24, 2017
shares
Debt Instrument [Line Items]              
Corporate debt         $ 3,484,606 $ 4,339,208  
Average interest rate         3.70% 3.90%  
Employee stock ownership plan, shares | shares             350,000
Revolver              
Debt Instrument [Line Items]              
Interest expense         $ 0    
Debt maturity         Aug. 05, 2019    
Additional bonds pledged as collateral         $ 5,000,000    
Maximum borrowing capacity         1,750,000    
Amount outstanding on facility         $ 0 $ 0  
London Interbank Offered Rate (LIBOR) [Member] | Revolver              
Debt Instrument [Line Items]              
Variable interest rate         2.00%    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Revolver              
Debt Instrument [Line Items]              
Variable interest rate         3.50%    
Capital Lease Obligations [Member]              
Debt Instrument [Line Items]              
Interest rate         4.70%    
Capital lease, pledged bonds         $ 923,563 923,766  
Gain (loss) on capital lease         0    
Lease payments $ 346,000 $ 404,928     70,051 501,976  
Outstanding lease obligation         0 805,013  
Debt Obligation [Member]              
Debt Instrument [Line Items]              
Face amount of debt instrument         $ 3,500,000    
Interest rate         3.65%    
Optional prepayment         $ 500,000    
Optional prepayment term         36 months    
Term of debt instrument         5 years    
Employee stock ownership plan, shares | shares         1,500,000    
Debt Obligation [Member] | Bofi Federal Bank B [Member]              
Debt Instrument [Line Items]              
Repayments of borrowed funds       $ 500,000      
Face amount of debt instrument         $ 500,000    
Debt Obligation [Member] | Bofi Federal Bank C [Member]              
Debt Instrument [Line Items]              
Repayments of borrowed funds     $ 75,000        
Face amount of debt instrument         $ 75,000    
Debt Obligation [Member] | Bofi Federal Bank B & C [Member]              
Debt Instrument [Line Items]              
Number of debt agreements | item         2    
Debt         $ 3,484,606 $ 3,534,195