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Debt (Narrative) (Details)
3 Months Ended 12 Months Ended
Mar. 07, 2018
USD ($)
Mar. 02, 2018
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
item
Debt Instrument [Line Items]          
Corporate debt     $ 3,491,077   $ 4,339,208
Current interest rate     3.70%   3.90%
Revolver          
Debt Instrument [Line Items]          
Interest expense     $ 0    
Interest rate       0.00%  
Debt maturity     Aug. 01, 2018    
Collateral     $ 5,000,000    
Maximum borrowing capacity     $ 1,750,000    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Revolver          
Debt Instrument [Line Items]          
Variable interest rate     2.00%    
London Interbank Offered Rate (LIBOR) [Member] | Maximum | Revolver          
Debt Instrument [Line Items]          
Variable interest rate     3.50%    
Capital Lease Obligations [Member]          
Debt Instrument [Line Items]          
Interest rate         4.70%
Collateral     $ 923,563   $ 923,766
Gain (loss) on capital lease     0 $ 0  
Lease payments $ 346,000 $ 404,928 $ 70,051 125,494  
Outstanding lease obligation         805,013
Debt Obligation [Member]          
Debt Instrument [Line Items]          
Face amount of debt instrument       $ 3,500,000  
Interest rate     3.65%    
Debt     $ 3,491,077   3,534,195
Collateral     $ 1,500,000    
Term of debt instrument     5 years    
Debt Obligation [Member] | Bofi Federal Bank B [Member]          
Debt Instrument [Line Items]          
Face amount of debt instrument         500,000
Debt Obligation [Member] | Bofi Federal Bank C [Member]          
Debt Instrument [Line Items]          
Face amount of debt instrument         $ 75,000
Debt Obligation [Member] | Bofi Federal Bank B & C [Member]          
Debt Instrument [Line Items]          
Face amount of debt instrument     $ 500,000    
Number of debt agreements | item         2
Optional prepayment term     12 months    
Debt     $ 3,491,077   $ 3,534,195
Term of debt instrument     36 months