Quarterly report pursuant to Section 13 or 15(d)

Operating Leases (Details Textual)

v3.20.2
Operating Leases (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Leases [Line Items]    
Operating lease cost $ 2,765 $ 2,724
Minimum [Member]    
Leases [Line Items]    
Operating leases, remaining lease term 1 year  
Maximum [Member]    
Leases [Line Items]    
Operating leases, remaining lease term 10 years