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Credit Facility (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
May 09, 2016
Revolving line of credit facility [Member]      
Line of Credit Facility [Line Items]      
Borrowing capacity under credit facility $ 20,000,000   $ 45,000,000
Outstanding balance $ 0 $ 6,500,000  
Additional borrowing capacity     $ 25,000,000
Maturity date May 09, 2021    
Pledge of capital stock to U.S. subsidiaries 100.00%    
Pledge of capital stock to direct foreign subsidiaries 66.00%    
Interest rate 4.00%    
Debt balance $ 0    
Amount drawn on loan 1,000,000 5,000,000  
Payment of principal 7,500,000 17,500,000  
Debt issuance costs $ 100,000 $ 200,000  
Revolving line of credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Line of Credit Facility [Line Items]      
Margin percentage base rate 1.25%    
Revolving line of credit facility [Member] | Base Rate [Member]      
Line of Credit Facility [Line Items]      
Margin percentage base rate 0.75%    
Term Loan [Member]      
Line of Credit Facility [Line Items]      
Borrowing capacity under credit facility $ 47,000,000