Note 6 - Impairment Losses & Restructuring Exit Cost - Restructuring and Related Costs (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Balance	$ 25	$ 1,840
Accruals/(reversals)	1,964	1,855
Payments	(1,931)	(3,670)
Ending balance	58	25
Employee Severance [Member]
Balance	0	1,326
Accruals/(reversals)	1,926	1,499
Payments	(1,868)	(2,825)
Ending balance	58	0
Facility Closing [Member]
Balance	25	514
Accruals/(reversals)	38	356
Payments	(63)	(845)
Ending balance	$ 0	$ 25