Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenues	$ 8,017			$ 7,559			$ 19,920	$ 17,810
Net (loss) income	314	$ (356)	$ (998)	678	$ (778)	$ 398	(1,040)	298
Total assets	49,682						49,682		$ 49,974
Total liabilities	4,850						4,850		3,774
CHINA
Revenues	1			2			2	17
Net (loss) income	(142)			$ (47)			(193)	$ (85)
Total assets	994						994		1,235
Total liabilities	150						150		92
Total net assets	$ 844						$ 844		$ 1,143