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Note 8 - Stockholders' Equity (Details Textual) - USD ($) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 16, 2023 | Jun. 21, 2023 | Dec. 16, 2022 | Apr. 12, 2022 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 06, 2023
Proceeds from Issuance of Common Stock |  |  |  |  | $ 4,388,000 | $ 5,540,000 |
Payments of Stock Issuance Costs |  |  |  |  | $ 662,000 | $ 418,000 |
November 2023 Financing [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 2,000,000 |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 0.65 |  |  |  |  |  |
Proceeds from Issuance of Common Stock | $ 1,300,000 |  |  |  |  |  |
Payments of Stock Issuance Costs | $ 312,000 |  |  |  |  |  |
June 2023 Financing [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 1,133,141 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 2.336 |  |  |  |  |
Proceeds from Issuance of Common Stock |  | $ 2,600,000 |  |  |  |  |
Payments of Stock Issuance Costs |  | $ 194,000 |  |  |  |  |
June 2023 Financing [Member] | Company’s Directors and Executive Officers [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 203,337 |  |  |  |  |
Sales Agreement with Cantor Fitzgerald Co (Cantor) [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 215,224 | 711,511 |
Proceeds from Issuance of Common Stock |  |  |  |  | $ 441,000 | $ 1,803,000 |
Payments of Stock Issuance Costs |  |  |  |  | 179,000 | $ 256,000 |
Sale of Stock, Aggregate Value, Maximum |  |  |  | $ 10,500,000 |  |  |
Accrued Sales Commission, Current, Percentage |  |  |  | 3.00% |  |  |
Sales Agreement With H.C. Wainwright & Co., LLC [Member] |  |  |  |  |  |  |
Sale of Stock, Aggregate Value, Maximum |  |  |  |  | $ 2,750,000 |  |
Accrued Sales Commission, Current, Percentage |  |  |  |  |  |  | 3.00%
Private Placement [Member] | Qualified Institutional Buyers and Institutional Accredited Investors [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 2,122,017 |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 1.68 |  |  |  |
Proceeds from Issuance of Common Stock |  |  | $ 3,400,000 |  |  |  |
Payments of Stock Issuance Costs |  |  | $ 162,000 |  |  |  |
Private Placement [Member] | Company’s Directors and Executive Officers [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 499,997 |  |  |  |

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