Note 11 - Segment Information and Foreign Operations - Segment Revenue Reporting by Geographic Region (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
CHINA
Revenue	14,492	16,947	27,918	28,464
TAIWAN
Revenue	530	3,420	1,751	8,002
JAPAN
Revenue	704	796	1,422	1,786
Asia Pacific Excluding China, Taiwan and Japan [Member]
Revenue	427	712	1,208	1,510
Europe [Member]
Revenue	1,597	4,689	3,698	8,414
North America [Member]
Revenue	$ 224	$ 1,359	$ 1,333	$ 2,435