Note 3 - Stock Split (Details Textual)	Aug. 13, 2020 $ / shares	Jul. 07, 2017	Sep. 30, 2020 $ / shares	Dec. 31, 2019 $ / shares
Common Stock, Par or Stated Value Per Share (in dollars per share)			$ 0.01	$ 0.01
Stock Split To [Member]
Stockholders' Equity Note, Stock Split, Conversion Ratio	3	5
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%