Note 8 - Goodwill (Details Textual) $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Number of Reporting Units			2
Goodwill, Impairment Loss	$ 24,400	$ 18,100	$ 42,520	$ 0	$ 0

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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