Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Details)

v3.20.2
Borrowings (Details)
 6 Months Ended
Jun. 27, 2020
USD ($)
Jun. 29, 2019
JP Morgan Chase Bank | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity (up to) $ 30,000,000  
Revolving loan payable $ 0  
Unused credit commitment fee (percent) 0.25%  
Credit facility trigger amount $ 3,600,000  
Consecutive business days below minimum excess availability 3 days  
Number of consecutive days excess availability is above required amount 45 days  
Event of default amount $ 0  
Minimum availability required under availability block $ 3,000,000  
Minimum fixed charge ratio if less than minimum excess availability 1.0  
Excess availability under credit facility $ 11,452,000  
Principal payments due 0  
JP Morgan Chase Bank | Letter of Credit    
Line of Credit Facility [Line Items]    
Maximum borrowing capacity (up to) 13,609,000  
Outstanding letters of credit amount $ 11,900,000  
One-Month London Interbank Offered Rate (LIBOR) | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Applicable margin for LIBOR-based interest rate and applicable margin for alternate based rate (percent)   1.25%
Base Rate | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Applicable margin for LIBOR-based interest rate and applicable margin for alternate based rate (percent)   1.75%
Base Rate | JP Morgan Chase Bank | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Applicable margin for LIBOR-based interest rate and applicable margin for alternate based rate (percent) 0.25%  
Interest rate (percent) 3.50%  
LIBOR based interest rate, principal amount $ 0  
London Interbank Offered Rate (LIBOR) | JP Morgan Chase Bank | Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Interest rate (percent) 1.94%  
LIBOR based interest rate, principal amount $ 0