Quarterly report pursuant to Section 13 or 15(d)

Debt (Narrative) (Details)

v3.21.1
Debt (Narrative) (Details)
3 Months Ended
Oct. 29, 2020
USD ($)
item
Mar. 31, 2021
USD ($)
Aug. 28, 2020
USD ($)
Line of Credit [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum borrowing capacity     $ 5,000,000
Line of credit, amount outstanding   $ 0  
Line of credit, remaining borrowing capacity   $ 2,101,000  
Line of credit facility, interest rate at period end   2.00%  
Line of credit, expiration date   Aug. 28, 2021  
Line of Credit [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Line of credit, basis spread on variable rate   1.25%  
Letter of Credit [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum borrowing capacity $ 2,000,000    
Minimum [Member] | Line of Credit [Member]      
Debt Instrument [Line Items]      
Ability to obtain letter of credit, number of letters of credit | item 1    
Minimum [Member] | Line of Credit [Member] | LIBOR [Member]      
Debt Instrument [Line Items]      
Line of credit, basis spread on variable rate   0.75%