Note 2 - Summary of Significant Accounting Policies - Summary of Contract Liabilities (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Revenue recognized related to contract liabilities as of the beginning of the respective period | $ 30,000 | $ 10,000 | $ 462,000 | $ 10,000 |