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Note 9 - Stockholders' Equity - Dividend Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Dividends per share (in dollars per share) | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 |  | $ 0.64
Dividends |  |  |  |  | $ 9,138 | $ 7,344
Special Dividends Declared October 29, 2019 [Member] |  |  |  |  |  |
Dividends per share (in dollars per share) |  |  |  |  |  | $ 0.40
Dividends |  |  |  |  |  | $ 4,608
Special Dividends Declared January 27, 2019 [Member] |  |  |  |  |  |
Dividends per share (in dollars per share) |  |  |  |  |  | $ 0.08
Dividends |  |  |  |  |  | $ 912
Dividends Declared January 27, 2019 [Member] |  |  |  |  |  |
Dividends per share (in dollars per share) |  |  |  |  |  | $ 0.16
Dividends |  |  |  |  |  | $ 1,824

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