Note 7 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Depreciation, Total	$ 2,300	$ 2,500	$ 7,000	$ 7,500
Assets Held-for-sale, Not Part of Disposal Group, Current, Total	4,170		4,170		$ 0
SWITZERLAND
Assets Held-for-sale, Not Part of Disposal Group, Current, Total	2,100		2,100
NEW JERSEY
Assets Held-for-sale, Not Part of Disposal Group, Current, Total	1,600		1,600
HONG KONG
Assets Held-for-sale, Not Part of Disposal Group, Current, Total	$ 500		$ 500