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Note 13 - Information Concerning Product Lines, Geographic Information and Revenue Concentration - Schedule of Revenue by Shipment Destination (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Revenue	$ 2,029	$ 4,209	$ 10,041	$ 13,974
Asia Pacific [Member]
Revenue	956	508	1,948	1,637
North America [Member]
Revenue	1,037	3,609	7,878	11,903
Europe [Member]
Revenue	$ 36	$ 92	$ 215	$ 434

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Amount, excluding 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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