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Note 10 - Third Amendment to Amended and Restated Certificate of Incorporation (Details Textual) - $ / shares | Dec. 31, 2020 | Dec. 31, 2019 | May 31, 2018 | Apr. 30, 2018
--- | --- | --- | --- | ---
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01 |
Common Stock, Shares Authorized (in shares) | 192,000,000 | 192,000,000 | 192,000,000 | 96,000,000

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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 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + 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 + Details
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