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Note 9 - Line of Credit (Details Textual) - USD ($)
$ in Thousands
Aug. 09, 2018
Sep. 29, 2018
Aug. 08, 2018
Dec. 30, 2017
Long-term Line of Credit, Noncurrent   $ 24,460   $ 27,279
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   3.80%    
Long-term Line of Credit, Noncurrent   $ 24,500   27,300
Letters of Credit Outstanding, Amount   800   $ 800
Line of Credit Facility, Remaining Borrowing Capacity   $ 19,700    
Citizens Bank of Pennsylvania [Member] | Letter of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity     $ 5,000