Note 10 - Stockholders' Equity (Deficit) - Warrant Assumptions (Details) - The 2020 Warrants [Member] |
Jul. 31, 2020 |
|---|---|
| Measurement Input, Share Price [Member] | |
| Warrant, assumptions | 2.25 |
| Measurement Input, Expected Term [Member] | |
| Warrant, assumptions | 3 |
| Measurement Input, Risk Free Interest Rate [Member] | |
| Warrant, assumptions | 0.0028 |
| Measurement Input, Expected Dividend Rate [Member] | |
| Warrant, assumptions | 0 |
| Measurement Input, Price Volatility [Member] | |
| Warrant, assumptions | 1.26 |