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Note 1 - Basis of Presentation and General Information - Excess of Consideration Over Acquired Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Consideration in cash $ 62,000 $ 14,350 $ 23,450
Less: Carrying value of net assets of companies acquired 0 7,649 1,190
Excess of consideration over acquired assets $ 62,000 $ 6,701 $ 22,260