Note 4 - At the Market Offering (Details Textual) - H.C. Wainwright & Co [Member] - The Market Offering Agreement "ATM Agreement" [Member] - USD ($) shares in Thousands, $ in Millions |
1 Months Ended | |
|---|---|---|
Jan. 31, 2022 |
Jun. 30, 2022 |
|
| Sale of Stock Agreement, Maximum Aggregate Gross Proceeds | $ 12.9 | |
| Shares, Issued, Ending Balance (in shares) | 0 |