Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Revenues	$ 5,535	$ 5,033
Net (loss) income	(998)	398
Total assets	49,621		$ 49,974
Total liabilities	4,488		3,774
CHINA
Revenues	1	11
Net (loss) income	(13)	$ 25
Total assets	1,232		1,235
Total liabilities	98		92
Total net assets	$ 1,134		$ 1,143