Note 6 - Stockholders' Equity and Stock-based Compensation Expense - Stock Option and Performance Award Activity (Details) |
3 Months Ended |
|---|---|
|
Mar. 31, 2026
shares
| |
| Outstanding, options (in shares) | 4,157,094 |
| Options granted (in shares) | 0 |
| Options exercised (in shares) | 0 |
| Options forfeited/canceled (in shares) | 0 |
| Outstanding, options (in shares) | 4,157,094 |
| Performance Shares [Member] | |
| Outstanding, performance awards (in shares) | 7,142 |
| Performance awards granted (in shares) | 0 |
| Performance awards exercised (in shares) | 0 |
| Performance awards forfeited/canceled (in shares) | 0 |
| Outstanding, performance awards (in shares) | 7,142 |
| X | ||||||||||
- Definition Number of non-option equity instruments exercised by participants. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Net number of non-option equity instruments granted to participants. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Details
|