Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Revenues	$ 7,042		$ 5,461		$ 11,999	$ 12,748
Net loss	(421)	$ 281	(1,044)	$ (414)	(140)	(1,458)
Total assets	48,994				48,994		$ 50,388
Total liabilities	5,425				5,425		6,674
CHINA
Revenues	0		2		0	2
Net loss	(15)		$ 1		(28)	$ (19)
Total assets	816				816		846
Total liabilities	85				85		67
Total net assets	$ 731				$ 731		$ 779