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Note 7 - Stock Split (Details Textual) | Aug. 13, 2020 $ / shares | Jul. 07, 2017 | Dec. 31, 2020 $ / shares | Dec. 31, 2019 $ / shares | May 31, 2018 $ / shares
--- | --- | --- | --- | --- | ---
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  | $ 0.01 | $ 0.01 | $ 0.01
Stock Split To [Member] |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 3 | 5 |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 |  |  |  |
Stockholders' Equity Note, Stock Split, Dividend Settlement, Percent | 50.00% |  |  |  |
Stock Split from [Member] |  |  |  |  |
Stockholders' Equity Note, Stock Split, Conversion Ratio | 2 | 3 |  |  |
Stock Split [Member] |  |  |  |  |
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 |  |  |  |
Stockholders' Equity Note, Stock Split, Dividend Settlement, Percent | 50.00% |  |  |  |

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