Note 3 - Revenue From Contracts With Customers and Other Revenue - Changes in Contract Liabilities (Details) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2023 |
Sep. 30, 2022 |
Sep. 30, 2023 |
Sep. 30, 2022 |
|
| Total deferred revenue related to contracts with customers, beginning of period | $ 700,000 | $ 700,000 | $ 700,000 | $ 700,000 |
| Deferred revenue related to milestones achieved | 0 | 0 | 0 | 100,000 |
| Deferred revenue related to milestones achieved, written off due to contract renegotiations | 0 | 0 | 0 | (100,000) |
| Total deferred revenue related to contracts with customers, end of period | $ 700,000 | $ 700,000 | $ 700,000 | $ 700,000 |
| X | ||||||||||
- Definition Amount of revenue deferred for which consideration to the customer has not been performed related to sublicense. No definition available.
|
| X | ||||||||||
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from contract modification which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|