Note 7 - Investments in Privately Held Raw Material Companies (Details Textual) - USD ($) $ in Thousands |
1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jan. 25, 2021 |
May 31, 2026 |
Apr. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2022 |
Dec. 31, 2025 |
|||||
| Equity Method Investments | $ 14,055 | $ 14,055 | $ 14,968 | ||||||||||
| Chaoyang Kaimei Quartz Co [Member] | |||||||||||||
| Equity Method Investments | $ 4,708 | $ 4,708 | 4,713 | ||||||||||
| Equity Method Investment, Ownership Percentage | [1] | 40.00% | 40.00% | ||||||||||
| Beijing Jiya [Member] | |||||||||||||
| Equity Method Investments | $ 4,508 | $ 4,508 | 4,428 | ||||||||||
| Equity Method Investment, Ownership Percentage | 39.00% | 39.00% | |||||||||||
| Xiaoyi Xingan Gallium [Member] | |||||||||||||
| Equity Method Investments | $ 4,839 | $ 4,839 | $ 5,827 | ||||||||||
| Equity Method Investment, Ownership Percentage | [2] | 25.00% | 25.00% | ||||||||||
| Proceeds from Dividends Received | $ 1,500 | ||||||||||||
| Jia Mei Investment [Member] | |||||||||||||
| Proceeds from Dividends Received | $ 500 | $ 900 | |||||||||||
| Five Minority Investments [Member] | |||||||||||||
| Equity Method Investments, Income (Loss), Excluding Impairment Charges | $ 400 | $ 200 | $ 800 | $ 200 | |||||||||
| Beijing Tongmei Xtal Technology [Member] | |||||||||||||
| Percentage of Equity Issued on Conversion of Non Controlling Interests | 7.28% | 14.50% | |||||||||||
| |||||||||||||