Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Revenues	$ 5,558		$ 7,042		$ 11,940	$ 11,999
Net loss	(689)	$ (739)	(421)	$ 281	(1,428)	(140)
Total assets	47,003				47,003		$ 48,797
Total liabilities	6,339				6,339		6,842
CHINA
Revenues	0		0		0	0
Net loss	(12)		$ (15)		(30)	$ (28)
Total assets	799				799		788
Total liabilities	98				98		84
Total net assets	$ 701				$ 701		$ 704