Note 7 - Stock Options (Details Textual) - USD ($) shares in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Share-Based Payment Arrangement, Expense | $ 0 | $ 1,287 | $ 0 | $ 5,679 |
| Rolling Stock Option Plan [Member] | ||||
| Share-based Compensation Arrangement, Percent of Issued and Outstanding Common Shares Reserved | 10.00% | 10.00% | ||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 0 | 0 | ||
| Share-Based Payment Arrangement, Expense | $ 0 | $ 1,287 | $ 0 | $ 5,679 |
| Rolling Stock Option Plan [Member] | Vesting Every Six Months [Member] | ||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage | 20.00% | |||
| Rolling Stock Option Plan [Member] | Share-Based Payment Arrangement, Tranche One [Member] | ||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage | 20.00% | |||