Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Revenues	$ 5,461		$ 6,368		$ 12,748	$ 11,903
Net loss	(1,044)	$ (414)	(356)	$ (998)	(1,458)	(1,354)
Total assets	49,609				49,609		$ 50,124
Total liabilities	5,959				5,959		5,283
CHINA
Revenues	2		0		2	1
Net loss	1		$ (38)		(19)	$ (51)
Total assets	879				879		929
Total liabilities	89				89		79
Total net assets	$ 790				$ 790		$ 850