Note 6 - Liabilities Related to Sale of Future Royalties 1 (Details Textual) - HCRP [Member] - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
Apr. 30, 2016 |
Mar. 31, 2026 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Proceeds from Sale of Future Royalties, Net | $ 20.0 | |||
| Royalty Interest, Covenant, Cumulative Remaining Shortfall Amount | $ 6.7 | $ 4.4 | $ 6.0 | |
| Royalty Payment, Interest, First Period [Member] | ||||
| Royalty Interest, Covenant, Shortfall in Royalty Payments | $ 3.0 | |||
| Royalty Interest, Percentage of Additional Royalties Due Each Year | 15.00% | |||
| Royalty Interest, Additional Royalties Due Each Year | $ 1.0 | |||
| Royalty Payment, Interest, Second Period [Member] | ||||
| Royalty Interest, Covenant, Shortfall in Royalty Payments | $ 2.7 | |||
| Royalty Interest, Percentage of Additional Royalties Due Each Year | 15.00% | |||
| Royalty Interest, Additional Royalties Due Each Year | $ 1.0 | |||