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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%

X

- Definition

The percent dividend settlement amount for holders of common stock in a stock split.

+ References

No definition available.

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- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770

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