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Note 7 - Goodwill (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Number of Reporting Units     2
Goodwill, Impairment Loss $ 0 $ 18,144 $ 42,500