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Note 16 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 24, 2021 | Jan. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 18, 2021 | Jan. 02, 2019
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  |  | $ 0 | $ 0 | $ 0 |  |
Revolving Credit Facility [Member] | The 2019 Senior Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | $ 200
Subsequent Event [Member] | Common Stock and Class A Common Stock [Member] |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.08 |  |  |  |  |  |
Dividends Payable, Date to be Paid | Mar. 31, 2021 |  |  |  |  |  |
Dividends Payable, Date of Record | Mar. 15, 2021 |  |  |  |  |  |
Subsequent Event [Member] | Revolving Credit Facility [Member] | The Amended 2019 Senior Credit Facility [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 300 |
Quincy [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 925 |  |  |  |  |
Business Acquisition, Termination Option, Fee |  | $ 25 |  |  |  |  |

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