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Concentration of risk (Details)
3 Months Ended 12 Months Ended
Mar. 28, 2020
USD ($)
Customer
Dec. 28, 2019
USD ($)
Customer
Aug. 30, 2019
USD ($)
Accounts Receivable, Net [Abstract]      
Receivables due amount $ 39,873,177 $ 37,941,900  
Term Loan [Member] | Minimum [Member]      
Interest Rate Risk [Abstract]      
Basis spread on variable rate 1.25%    
Term Loan [Member] | Maximum [Member]      
Interest Rate Risk [Abstract]      
Basis spread on variable rate 2.25%    
Term Loan [Member] | LIBOR [Member]      
Interest Rate Risk [Abstract]      
Term of variable rate 1 month    
Term Loan [Member] | Interest Rate Swap [Member]      
Interest Rate Risk [Abstract]      
Interest rate swap, notional amount $ 49,375,000   $ 50,000,000
Revolving Credit Loan [Member] | Minimum [Member]      
Interest Rate Risk [Abstract]      
Basis spread on variable rate 0.25%    
Revolving Credit Loan [Member] | Maximum [Member]      
Interest Rate Risk [Abstract]      
Basis spread on variable rate 1.25%    
Revolving Credit Loan [Member] | LIBOR [Member] | Minimum [Member]      
Interest Rate Risk [Abstract]      
Basis spread on variable rate 1.25%    
Revolving Credit Loan [Member] | LIBOR [Member] | Maximum [Member]      
Interest Rate Risk [Abstract]      
Basis spread on variable rate 2.25%    
Accounts Receivable [Member] | Customer Concentration Risk [Member]      
Accounts Receivable, Net [Abstract]      
Number of major customers | Customer   0  
Percentage of concentration risk   10.00%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Ford Motor Company [Member]      
Accounts Receivable, Net [Abstract]      
Number of major customers | Customer 1    
Receivables due amount $ 4,205,000    
Percentage of concentration risk 11.00%