Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Revenues	$ 7,851			$ 7,988			$ 19,850	$ 20,736
Net loss	80	$ (421)	$ 281	459	$ (1,044)	$ (414)	(60)	(999)
Total assets	50,117						50,117		$ 50,388
Total liabilities	6,253						6,253		6,674
CHINA
Revenues	0			0			0	2
Net loss	(13)			$ (17)			(41)	$ (36)
Total assets	829						829		846
Total liabilities	92						92		67
Total net assets	$ 737						$ 737		$ 779