Note 6 - China Joint Venture (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | 37 Months Ended | ||||
|---|---|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 01, 2023 |
Dec. 31, 2019 |
|
| Corporate Joint Venture [Member] | |||||||
| Joint Venture, Required Capital Contribution | $ 408,000 | $ 357,000 | |||||
| Joint Venture, Increase from Capital Contributions | $ 0 | $ 30,000 | $ 0 | $ 61,000 | $ 214,000 | ||
| China JV Partner [Member] | |||||||
| Ownership Interest, Percent | 51.00% | ||||||