Note 4 - Restructuring Activities - Charges and Net Assets (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Total revenues	$ 8,155			$ 6,452			$ 16,334	$ 25,555
Net loss	2,376	$ (2,544)	$ (2,567)	(1,278)	$ (945)	$ (1,289)	(2,735)	(3,512)
Total assets	31,525						31,525		$ 31,606
Total liabilities	7,694						7,694		5,431
CHINA
Total revenues	6						11	311
Net loss	(73)			$ (80)			(31)	$ (1,469)
Total assets	3,134						3,134		4,249
Total liabilities	380						380		399
Total net assets	$ 2,754						$ 2,754		$ 3,850