Note 6 - Impairment Losses & Restructuring/Exit Cost (Details Textual) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Goodwill, Impairment Loss	$ 0	$ 0	$ 22,708	$ 35,944
Employee Severance [Member]
Restructuring and Related Cost, Expected Cost Remaining	$ 58	$ 58

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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