Note 4 - Liquidity and Business Plan (Details Textual) - USD ($) $ in Millions |
3 Months Ended | |||||
|---|---|---|---|---|---|---|
Jan. 31, 2024 |
Dec. 21, 2023 |
Nov. 02, 2023 |
Jun. 21, 2023 |
Jan. 31, 2023 |
Mar. 31, 2023 |
|
| Registered Public Offering [Member] | ||||||
| Proceeds from Issuance or Sale of Equity | $ 8.1 | $ 8.5 | $ 15.0 | |||
| Inducement Warrant [Member] | ||||||
| Proceeds from Issuance or Sale of Equity | $ 2.0 | $ 1.9 | ||||
| ATM Program [Member] | ||||||
| Proceeds from Issuance or Sale of Equity | $ 1.6 |