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Note I - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Apr. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Common Stock, Shares Authorized (in shares) |  |  | 100,000,000 | 85,000,000 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 2.18 | $ 1.97 |
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares) |  |  | 2,066,343 | 2,428,329 | 2,375,760
Chief Executive Officer, Chief Financial Officer and Employees [Member] |  |  |  |  |
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares) |  |  | 1,891,979 | 2,256,844 |
Non-Employees [Member] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  |  | 174,364 | 171,485 |
Warrants Associated With April 2020 Public Offering [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  | 2,710,000 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  | $ 1.20 |  |  |
Warrants and Rights Outstanding, Term (Year) |  | 3 years |  |  |
Warrants Associated With the June 2020 Public Offering [Member] |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | 3,749,000 |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 2.60 |  |  |  |
Warrants and Rights Outstanding, Term (Year) | 3 years |  |  |  |
April 6, 2020 Public Offering [Member] |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross |  | $ 5.1 |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 5,420,000 |  |  |
Share Price (in dollars per share) |  | $ 0.95 |  |  |
June 30, 2020 Public Offering [Member] |  |  |  |  |
Proceeds from Issuance of Common Stock, Gross | $ 14.6 |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 6,770,000 |  |  |  |
Share Price (in dollars per share) | $ 2.15 |  |  |  |

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