Note 11 - Segment Information and Foreign Operations - Reporting of Segment Revenue by Product Type (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue	$ 17,974	$ 27,923	$ 37,330	$ 50,611
Substrates [Member]
Revenue	11,292	19,745	22,374	36,648
Raw Materials and Other [Member]
Revenue	$ 6,682	$ 8,178	$ 14,956	$ 13,963

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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+ Details