Note 7 - Cash Dividend (Details Textual) - USD ($) $ / shares in Units, $ in Millions	Jan. 29, 2021	Dec. 02, 2020	Nov. 24, 2020
Common Stock, Dividends, Per Share, Declared (in dollars per share)		$ 6.00	$ 3.00
Dividends, Cash, Total	$ 279.9
Dividends Payable, Date Declared			Nov. 24, 2020
Dividends Payable, Date of Record			Dec. 04, 2020
Dividends Payable, Date to be Paid			Jan. 29, 2021

Aggregate dividends declared during the period for each share of common stock outstanding.

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Date the declared dividend will be paid, in CCYY-MM-DD format.

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Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred.

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