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Notes Payable (Details)
3 Months Ended
Jul. 19, 2016
USD ($)
Sep. 30, 2017
USD ($)
Mar. 31, 2017
Mar. 31, 2018
USD ($)
Notes payable to banks | Purchase of Columbia, South Carolina facility        
Debt Instrument [Line Items]        
Notes payable to banks       $ 1,219
Fixed interest rate on debt (percentage) 5.29%      
Debt instrument monthly payment $ 11,000      
Debt instrument, term (in years) 15 years      
Notes payable to banks | Smaller installment loans        
Debt Instrument [Line Items]        
Debt instrument, number of loans     15  
Long-term debt       $ 1,509,000
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       $ 1,004,000
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       2,000,000
Summit Community Bank | Letter of credit        
Debt Instrument [Line Items]        
Line of credit / commitment from Bank       $ 1,500,000