Note 2 - Summary of Significant Accounting Policies - Securities Excluded from Calculation of Earnings Per Share (Details) - shares |
12 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Securites excluded (in shares) | 4,236,467 | 14,375,203 |
| Liability Warrants [Member] | ||
| Securites excluded (in shares) | 2,190,681 | 3,821,115 |
| Equity Warrants [Member] | ||
| Securites excluded (in shares) | 1,630,434 | 15,571 |
| Liability Prefunded Warrants [Member] | ||
| Securites excluded (in shares) | 0 | 10,293,983 |
| Share-Based Payment Arrangement, Option [Member] | ||
| Securites excluded (in shares) | 202,265 | 211,618 |
| Restricted Stock [Member] | ||
| Securites excluded (in shares) | 213,087 | 32,916 |