Note 14 - Segment Information - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Oct. 02, 2021	Sep. 26, 2020	Oct. 02, 2021	Sep. 26, 2020
Revenue	$ 45,471	$ 31,561	$ 138,953	$ 109,246
UNITED STATES
Revenue	41,584	25,628	124,337	91,793
CANADA
Revenue	1,912	3,543	8,371	11,186
PUERTO RICO
Revenue	1,245	1,433	4,128	4,018
SERBIA
Revenue	$ 730	$ 957	$ 2,117	$ 2,249

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details