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Note 9 - Line of Credit (Details Textual) - USD ($)
$ in Thousands
Aug. 09, 2018
Mar. 30, 2019
Dec. 29, 2018
Aug. 08, 2018
Long-term Line of Credit, Noncurrent   $ 34,429 $ 27,540  
Citizens Bank of Pennsylvania [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 45,000     $ 40,000
Line of Credit, Loan Covenants, Waiver Granted, Amount of Certain Expenses Excluded $ 1,400      
Debt Instrument, Interest Rate, Effective Percentage   4.70%    
Long-term Line of Credit, Noncurrent   $ 34,400 27,500  
Letters of Credit Outstanding, Amount   1,600 $ 1,600  
Line of Credit Facility, Remaining Borrowing Capacity   $ 9,000    
Citizens Bank of Pennsylvania [Member] | Letter of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 5,000