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Note 6 - Related Party Transactions (Details Textual) - USD ($) |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2022 | Jan. 31, 2023 | Jul. 31, 2022 | May 31, 2022 | Jan. 31, 2022 | Dec. 31, 2021 | Oct. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2022
Short-Term Debt |  |  |  |  |  |  |  |  | $ 57,003,000 | $ 45,963,000 |
ChaoYang XinMei [Member] |  |  |  |  |  |  |  |  |  |  |
Payments for Advance to Affiliate | $ 1,100,000 |  |  | $ 800,000 |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 58.50% |  |  |  |  |  |  |  |
ChaoYang XinMei [Member] |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Period Increase (Decrease) |  |  | $ 610,000 |  |  |  |  |  |  |  |
Nonredeemable Noncontrolling Interests, Increase (Decrease) |  |  | 57,000 |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Subsidiary Equity Issuance | 4,500,000 |  |  |  |  |  |  |  |  |  |
Amount of Additional Investment in Joint Venture Agreement |  |  | 600,000 |  |  |  |  |  |  |  |
ChaoYang XinMei [Member] | Beijing Tongmei Xtal Technology [Member] |  |  |  |  |  |  |  |  |  |  |
Amount of Additional Investment in Joint Venture Agreement |  |  | $ 800,000 |  |  |  |  |  |  |  |
Chao Yang LiMei [Member] | Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations [Member] | Chaoyang Kaimei Quartz Co [Member] |  |  |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  |  |  |  |  |  |  |  |  | $ 1,500,000
Proceeds from Sale of Property, Plant, and Equipment |  | $ 1,500,000 |  |  |  |  |  |  |  |  |
Loan From Related Party [Member] | ChaoYang XinMei [Member] |  |  |  |  |  |  |  |  |  |  |
Nonredeemable Noncontrolling Interests, Increase (Decrease) |  |  |  | 100,000 |  |  |  |  |  |  |
Loan From Related Party [Member] | Minority Investor [Member] | ChaoYang XinMei [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  |  |  | $ 1,000,000 | $ 900,000 |  |  |
Short-Term Debt |  |  |  |  |  | $ 1,900,000 |  |  |  |  |
Payments for Advance to Affiliate | 700,000 |  |  | 600,000 |  |  |  |  |  |  |
Loan From Related Party [Member] | Beijing Tongmei Xtal Technology [Member] | ChaoYang XinMei [Member] |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  |  | $ 1,400,000 | $ 1,400,000 |  |  |  |  |
Short-Term Debt |  |  |  |  | 0 |  |  |  |  |  |
Noncontrolling Interest, Period Increase (Decrease) |  |  |  | 1,400,000 | 2,200,000 |  |  |  |  |  |
Nonredeemable Noncontrolling Interests, Increase (Decrease) |  |  |  |  | $ 200,000 |  |  |  |  |  |
Payments for Advance to Affiliate | $ 1,100,000 |  |  | $ 800,000 |  |  |  |  |  |  |

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