Note 4 - China Joint Venture (Details Textual) - USD ($) |
12 Months Ended | 31 Months Ended | |||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2025 |
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 | $ 61,000 | $ 0 | $ 214,000 | ||
| China JV Partner [Member] | |||||
| Ownership Interest, Percent | 51.00% | ||||