Note 1 - Organization and Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands |
1 Months Ended | 6 Months Ended | 45 Months Ended | |
|---|---|---|---|---|
Sep. 18, 2015 |
Sep. 30, 2015 |
Jun. 30, 2019 |
Jun. 30, 2019 |
|
| Proceeds From Sale of Royalty and Milestone Rights | $ 65,000 | $ 65,000 | ||
| Royalty Arrangment Maximum Payments | $ 195,000 | 195,000 | ||
| Net Proceeds from Sale of Future Royalties | $ 61,200 | $ 61,184 |