Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Details Textual) - Subsequent Event [Member] shares in Thousands	Apr. 18, 2022 $ / shares shares
Stock Issued During Period, Fractional Shares, Reverse Stock Split (in shares) \| shares	0
Reverse Stock Split, Fractional Shares, Cash, Multiple (in dollars per share) \| $ / shares	$ 12.93
Reverse Stock Split [Member ]
Stockholders' Equity Note, Stock Split, Conversion Ratio	50

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.

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 https://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770

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