Note 5 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands |
1 Months Ended | 6 Months Ended | |
|---|---|---|---|
|
Feb. 28, 2025
$ / shares
shares
|
Jun. 30, 2025
USD ($)
shares
|
Jun. 30, 2024
USD ($)
|
|
| Share-Based Payment Arrangement, Nonemployee [Member] | |||
| Share-Based Payment Arrangement, Expense | $ | $ 0 | $ 0 | |
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period (in shares) | 667 | ||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price (in dollars per share) | $ / shares | $ 33.75 | ||
| The 2016 Equity Plan [Member] | |||
| Percent of Shares Authorized Under Plan, Aggregate Shares Issued and Outstanding | 12.5 | ||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant | 2,086,654 | ||