Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Revenues	$ 7,988			$ 8,017			$ 20,736	$ 19,920
Net loss	459	$ (1,044)	$ (414)	314	$ (356)	$ (998)	(999)	(1,040)
Total assets	50,319						50,319		$ 50,124
Total liabilities	6,231						6,231		5,283
CHINA
Revenues	0			1			2	2
Net loss	(17)			$ (142)			(36)	$ (193)
Total assets	842						842		929
Total liabilities	73						73		79
Total net assets	$ 769						$ 769		$ 850