Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Revenues	$ 7,287	$ 5,535
Net loss	(414)	(998)
Total assets	50,282		$ 50,124
Total liabilities	5,680		5,283
CHINA
Revenues	0	1
Net loss	(20)	$ (13)
Total assets	913		929
Total liabilities	80		79
Total net assets	$ 833		$ 850