Note 6 - Stock-based Compensation (Details Textual) - USD ($) |
6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2025 |
Jun. 30, 2026 |
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 61.05 | $ 1.18 | $ 55.39 | |
| Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $ 1,371,524 | $ 1,300,000 | $ 1,371,524 | |
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition | 1 year 8 months 12 days | 2 years | ||