Note 11 - Operating Segment and Geographic Information (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2022 USD ($)	Dec. 25, 2021 USD ($)	Dec. 26, 2020 USD ($)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	27.50%
Assets, Total	$ 298,718	$ 251,798	$ 220,705
Number of Major Customers	1	1
Number of Employees Covered Under Collective Bargaining Agreement	31
Customer One [Member]
Number of Major Customers			1
Customer One [Member] \| Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	23.00%	21.00%	23.00%
Customer One [Member] \| Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage	28.00%	24.00%
Customer Two [Member] \| Customer Concentration Risk [Member] \| Revenue Benchmark [Member]
Concentration Risk, Percentage	12.00%	11.00%	13.00%
Customer Two [Member] \| Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage		10.00%
Customer Three [Member] \| Customer Concentration Risk [Member] \| Accounts Receivable [Member]
Concentration Risk, Percentage		17.00%
MEXICO
Assets, Total	$ 14,800	$ 15,800

The number of employees covered under collective bargaining agreement.

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Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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