Note 5 - Operating Lease Right-of-use (ROU) Asset, Net (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
|
| Operating Lease, Expense | $ 120,000 | $ 120,000 | $ 241,000 | $ 241,000 |
| Operating Lease, Payments | $ 124,000 | $ 121,000 | $ 249,000 | $ 242,000 |
| Operating Lease, Weighted Average Remaining Lease Term | 1 year 7 months 2 days | 1 year 7 months 2 days | ||
| Operating Lease, Weighted Average Discount Rate, Percent | 10.74% | 10.74% | ||