Note 6 - Borrowings (Details Textual) - USD ($) $ in Thousands			12 Months Ended
	Dec. 14, 2020	Jan. 21, 2019	Dec. 25, 2021	Jul. 07, 2021
Stock Repurchase Program, Authorized Amount	$ 15,000
Term Loan [Member]
Debt Instrument, Face Amount			$ 50,000	$ 50,000
Debt Instrument, Periodic Payment, Principal			595
Long-Term Debt, Maturity, Year One			7,100
Long-Term Debt, Maturity, Year Two			7,100
Long-Term Debt, Maturity, Year Three			7,100
Long-Term Debt, Maturity, Year Four			7,100
Long-Term Debt, Maturity, Year Five			29,000
2019 Restated Credit Agreement [Member]
Debt Instrument, Total Consideration Used for Acquisitions	$ 30,000	$ 25,000
Debt to EBITDA Ratio	1.75
2019 Restated Credit Agreement [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 75,000	50,000	$ 50,000	75,000
Debt Instrument, Interest Rate, Increase (Decrease)	0.25%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage, Increase (Decrease)	0.05%
2019 Restated Credit Agreement [Member] | Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 5,000
Amended and Restated Credit Agreement [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 50,000