Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Revenues	$ 4,957	$ 7,287
Net income (loss)	281	(414)
Total assets	49,446		$ 50,388
Total liabilities	5,490		6,674
CHINA
Revenues	0	0
Net income (loss)	(13)	$ (20)
Total assets	824		846
Total liabilities	74		67
Total net assets	$ 750		$ 779