Note 10 - Related Party Transactions (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Director [Member] | ||||
| Common Stock, Percentage of Beneficial Stock Outstanding | 5.00% | 5.00% | ||
| BHS [Member] | Royalty Agreement and License [Member] | ||||
| Royalty Expense | $ 8,000 | $ 9,000 | $ 17,000 | $ 18,000 |
| Related Party Transaction, Automatic Renewal Period of Agreement (Year) | 1 year | |||