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Notes Payable (Details)
3 Months Ended 9 Months Ended
Jul. 19, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2017
Sep. 30, 2018
USD ($)
Sep. 29, 2018
USD ($)
Notes payable to banks | Purchase of Columbia, South Carolina facility          
Debt Instrument [Line Items]          
Notes payable to banks       $ 1,188,000  
Fixed interest rate on debt (percentage) 5.29%        
Debt instrument monthly payment $ 11,000        
Debt instrument, term (in years) 15 years        
Maximum annual capital expenditures       3,500,000  
Notes payable to banks | Smaller installment loans          
Debt Instrument [Line Items]          
Debt instrument, number of loans     15    
Long-term debt       $ 1,345,000  
Notes payable to banks | Smaller installment loans | Minimum          
Debt Instrument [Line Items]          
Fixed interest rate on debt (percentage)       2.94%  
Notes payable to banks | Smaller installment loans | Maximum          
Debt Instrument [Line Items]          
Fixed interest rate on debt (percentage)       5.29%  
Summit Community Bank | Notes payable to banks          
Debt Instrument [Line Items]          
Notes payable to banks       $ 870,000  
Fixed interest rate on debt (percentage)       3.99%  
Debt instrument monthly payment   $ 26,000      
Limit on chattel mortgages on purchased equipment       $ 250,000  
Summit Community Bank | Line of credit          
Debt Instrument [Line Items]          
Line of credit / commitment from Bank       4,000,000 $ 2,000,000
Summit Community Bank | Letter of credit          
Debt Instrument [Line Items]          
Line of credit / commitment from Bank       $ 1,500,000