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Note 8 - Stockholders' Equity - Dividend Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019
Dividends per share (in dollars per share) | $ 0.40 |
Dividends | $ 4,570 | $ 2,736
Dividends Declared February 10, 2020 [Member] |  |
Dividends per share (in dollars per share) | $ 0.20 |
Dividends | $ 2,285 |
Dividends Declared May 4, 2020 [Member] |  |
Dividends per share (in dollars per share) | $ 0.20 |
Dividends | $ 2,285 |

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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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