Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Revenues	$ 7,490			$ 7,851			$ 19,430	$ 19,850
Net loss	303	$ (689)	$ (739)	80	$ (421)	$ 281	(1,125)	(60)
Total assets	47,913						47,913		$ 48,797
Total liabilities	6,904						6,904		6,842
CHINA
Revenues	0			0			0	0
Net loss	(12)			$ (13)			(42)	$ (41)
Total assets	800						800		788
Total liabilities	107						107		84
Total net assets	$ 693						$ 693		$ 704