Note 13 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Revenues	$ 24,261	$ 22,550
Net loss	54	(4,278)
Total assets	49,974	30,088
Total liabilities	3,774	7,767
CHINA
Revenues	22	25
Net loss	(114)	(281)
Total assets	1,235	2,463
Total liabilities	92	396
Total net assets	$ 1,143	$ 2,067