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Note 9 - Line of Credit (Details Textual) - USD ($)
$ in Thousands
Oct. 18, 2019
Sep. 28, 2019
Dec. 29, 2018
Sep. 29, 2018
Long-term Line of Credit, Noncurrent   $ 31,735 $ 27,540  
Citizens Bank of Pennsylvania [Member] | Revolving Credit Facility [Member]        
Debt Instrument, Interest Rate, Effective Percentage   4.60%   3.80%
Long-term Line of Credit, Noncurrent   $ 31,700 27,500  
Letters of Credit Outstanding, Amount   1,600 $ 1,600  
Line of Credit Facility, Remaining Borrowing Capacity   $ 11,700    
Citizens Bank of Pennsylvania [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 45,000