Note 1 - The Company and Summary of Significant Accounting Policies (Details Textual)
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1 Months Ended |
3 Months Ended |
12 Months Ended |
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Jan. 25, 2021
USD ($)
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May 31, 2025
USD ($)
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Apr. 30, 2025
USD ($)
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Mar. 31, 2025
USD ($)
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Jul. 31, 2024
USD ($)
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Jun. 30, 2024
USD ($)
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Dec. 31, 2023
USD ($)
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Sep. 30, 2023
USD ($)
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Aug. 31, 2023
USD ($)
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Jul. 31, 2023
USD ($)
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May 31, 2023
USD ($)
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Jan. 31, 2023
USD ($)
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Aug. 31, 2022
USD ($)
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Jul. 31, 2022
USD ($)
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May 31, 2022
USD ($)
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Apr. 30, 2022
USD ($)
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Jan. 31, 2022
USD ($)
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Dec. 31, 2021
USD ($)
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Oct. 31, 2021
USD ($)
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Sep. 30, 2021
USD ($)
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Jun. 30, 2021
USD ($)
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May 31, 2021
USD ($)
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Feb. 28, 2021
USD ($)
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Jan. 31, 2021
USD ($)
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Dec. 31, 2020 |
Dec. 31, 2020
USD ($)
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Dec. 31, 2025
USD ($)
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Dec. 31, 2024
USD ($)
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Dec. 31, 2023
USD ($)
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Dec. 31, 2022 |
Dec. 31, 2020
USD ($)
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| Number Of Product Lines |
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2
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| Companies Accounted For Under Equity Method Investments |
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3
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3
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| Gain (Loss), Foreign Currency Transaction, before Tax |
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$ (74,000)
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$ 91,000
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$ 169,000
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| Contract with Customer, Liability, Revenue Recognized |
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$ 1,600,000
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156,000
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| Number of Operating Segments |
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1
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| Restricted Cash, Current |
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$ 8,100,000
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10,978,000
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| Accounts Receivable, after Allowance for Credit Loss, Current |
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26,849,000
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25,640,000
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| Product Warranty Accrual, Current |
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$ 703,000
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411,000
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451,000
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703,000
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| Impairment, Long-Lived Asset, Held-for-Use |
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0
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0
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0
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| Asset Impairment Charges |
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$ 48,000
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0
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$ 1,900,000
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| Leasehold Improvements [Member] |
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| Property, Plant and Equipment, Useful Life (Year) |
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10 years
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| Building [Member] |
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| Property, Plant and Equipment, Useful Life (Year) |
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39 years 6 months
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| SEC Schedule, 12-09, Allowance, Credit Loss [Member] |
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| SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |
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$ 164,000
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147,000
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| Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) |
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17,000
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432,000
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| SEC Schedule, 12-09, Reserve, Sales Returns [Member] |
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| SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |
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48,000
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28,000
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| SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction |
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48,000
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28,000
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| SEC Schedule, 12-09, Valuation Allowances and Reserves, Addition, Recovery |
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$ 68,000
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$ 17,000
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| Current Top Five Customers [Member] |
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| Number of Major Customers |
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5
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| Third-party Customers [Member] |
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| Number of Major Customers |
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0
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2
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2
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| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Axt Tongmei Inc [Member] |
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| Disposal Group, Including Discontinued Operation, Consideration |
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$ 1
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| ChaoYang XinMei [Member] | Minority Investor [Member] |
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| Payments to Acquire Interest in Joint Venture |
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$ 4,500,000
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| Chao Yang ShouMei [Member] |
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| Proceeds from Noncontrolling Interests |
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$ 200,000
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$ 300,000
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| Proceeds from Contributions from Parent |
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$ 600,000
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1,000,000
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| Loan From Related Party [Member] | ChaoYang XinMei [Member] |
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| Proceeds from Noncontrolling Interests |
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$ 1,000,000
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$ 900,000
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| Minority Investor [Member] | Chao Yang ShouMei [Member] |
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| Nonredeemable Noncontrolling Interests, Increase (Decrease) |
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$ 200,000
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| Beijing Tongmei Xtal Technology [Member] |
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| Subsidiary, Ownership Percentage, Parent |
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85.50%
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| Subsidiary, Ownership Percentage, Noncontrolling Owner |
7.28%
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14.50%
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| Percentage of Equity Issued on Conversion of Non Controlling Interests |
7.28%
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7.59%
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14.50%
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| Percentage of Equity Purchased by Employees, Key Managers, and Contributors |
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0.40%
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| Capital Received From Private Equity Funds |
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$ 1,500,000
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$ 48,100,000
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$ 48,100,000
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| Capital Received, Approved |
$ 49,000,000
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| Increase in Noncontrolling Interests Due to Transfer of Subsidiary with Noncontrolling Interests |
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$ 1,200,000
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| Increase in Redeemable Noncontrolling Interests Due to Transfer of Subsidiary with Noncontrolling Interests |
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$ 1,200,000
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| Beijing Tongmei Xtal Technology [Member] | Nanjing Jin Mei Gallium [Member] |
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| Percentage of Equity Issued on Conversion of Non Controlling Interests |
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0.38%
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| ChaoYang XinMei [Member] |
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| Noncontrolling Interest, Period Increase (Decrease) |
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$ 610,000
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$ 1,400,000
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| Nonredeemable Noncontrolling Interests, Increase (Decrease) |
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57,000
|
100,000
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| Chao Yang ShouMei [Member] |
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| Subsidiary, Ownership Percentage, Parent |
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75.00%
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75.00%
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| Noncontrolling Interest, Period Increase (Decrease) |
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$ 200,000
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400,000
|
200,000
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| Nonredeemable Noncontrolling Interests, Increase (Decrease) |
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44,000
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$ 75,000
|
36,000
|
$ 73,000
|
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| Beijing Boyu Semiconductor Vessel Craftwork Technology Co [Member] |
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| Subsidiary, Ownership Percentage, Noncontrolling Owner |
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33.00%
|
33.00%
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33.00%
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| Nanjing Jin Mei Gallium [Member] |
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| Subsidiary, Ownership Percentage, Noncontrolling Owner |
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8.50%
|
8.50%
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|
8.50%
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| Nanjing Jin Mei Gallium [Member] | Nanjing Jin Mei Gallium [Member] |
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| Percentage of Equity Issued on Conversion of Non Controlling Interests |
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0.38%
|
| ChaoYang XinMei [Member] |
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| Total Investment of Joint Venture Agreement |
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$ 3,000,000
|
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| Joint Venture Formation, Projected Investment Payment |
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1,800,000
|
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| Joint Venture Agreement, Initial Investment Amount |
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$ 1,500,000
|
1,500,000
|
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|
|
| Payments to Acquire Interest in Joint Venture |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 1,400,000
|
$ 1,400,000
|
|
|
|
900,000
|
$ 900,000
|
|
|
|
|
|
|
|
|
|
| Investments |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 2,600,000
|
|
|
|
|
|
$ 1,800,000
|
|
|
|
|
|
|
|
|
|
|
| Payments for Advance to Affiliate |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
800,000
|
1,100,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Amount of Additional Investment in Joint Venture Agreement |
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 600,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ChaoYang XinMei [Member] | Minority Investor [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Investments |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,900,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Payments for Advance to Affiliate |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 600,000
|
700,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| ChaoYang XinMei [Member] | Beijing Tongmei Xtal Technology [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Subsidiary, Ownership Percentage, Parent |
|
|
|
|
|
|
|
|
|
|
|
|
|
58.50%
|
58.50%
|
|
58.50%
|
|
|
|
|
58.50%
|
58.50%
|
|
|
|
|
|
|
|
|
|
| Amount of Additional Investment in Joint Venture Agreement |
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 800,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Equity Method Investment, Ownership Percentage |
|
|
|
|
|
|
|
|
|
|
|
|
|
58.50%
|
58.50%
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Chao Yang ShouMei [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Total Investment of Joint Venture Agreement |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
4,400,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Joint Venture Formation, Projected Investment Payment |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
3,300,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Joint Venture Agreement, Initial Investment Amount |
|
|
|
|
|
|
|
|
|
|
|
|
1,000,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Noncontrolling Interest, Period Increase (Decrease) |
|
|
|
|
|
|
|
|
|
|
|
|
406,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Proceeds from Contributed Capital |
|
|
|
|
|
|
|
|
|
|
|
|
$ 334,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Chao Yang ShouMei [Member] | Chao Yang Jin Mei Gallium [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Nonredeemable Noncontrolling Interests, Increase (Decrease) |
|
|
|
|
|
|
|
|
|
|
|
500,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Chaoyang Kaimei Quartz Co [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Total Investment of Joint Venture Agreement |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
7,600,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Joint Venture Formation, Projected Investment Payment |
|
|
|
|
|
|
|
$ 2,300,000
|
|
|
|
|
|
|
|
$ 3,000,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Joint Venture Agreement, Initial Investment Amount |
|
|
|
|
|
|
|
|
|
|
|
|
|
$ 2,200,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Payments to Acquire Interest in Joint Venture |
|
$ 300,000
|
$ 300,000
|
$ 300,000
|
$ 300,000
|
$ 300,000
|
$ 600,000
|
|
$ 600,000
|
$ 600,000
|
|
$ 900,000
|
|
$ 900,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Amount of Additional Investment in Joint Venture Agreement |
|
|
|
|
|
|
|
$ 5,600,000
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Equity Method Investment, Ownership Percentage |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
40.00%
|
|
|
|
|
|
|
|
|
|
|
40.00%
|
[1] |
|
|
|
|
| Minimum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Temperature In Celsius |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
500
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life (Year) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1 year
|
|
|
|
|
|
| Minimum [Member] | Furniture and Fixtures [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life (Year) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
3 years
|
|
|
|
|
|
| Minimum [Member] | Machinery and Equipment [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life (Year) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1 year
|
|
|
|
|
|
| Minimum [Member] | Automobiles [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life (Year) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5 years
|
|
|
|
|
|
| Maximum [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Temperature In Celsius |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1,500
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life (Year) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
39 years 6 months
|
|
|
|
|
|
| Maximum [Member] | Furniture and Fixtures [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life (Year) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
5 years
|
|
|
|
|
|
| Maximum [Member] | Machinery and Equipment [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life (Year) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
20 years
|
|
|
|
|
|
| Maximum [Member] | Automobiles [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Property, Plant and Equipment, Useful Life (Year) |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10 years
|
|
|
|
|
|
| Revenue Benchmark [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Number of Major Customers |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
0
|
|
0
|
0
|
|
|
| Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Current Top Five Customers [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Concentration Risk, Percentage |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
29.00%
|
|
30.00%
|
25.00%
|
|
|
| Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Concentration Risk, Percentage |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10.00%
|
|
10.00%
|
|
|
|
| Raw Material Sales [Member] | Product Concentration Risk [Member] | Third-party Customers [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Concentration Risk, Percentage |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
10.00%
|
|
|
|
10.00%
|
|
| Specialty Material Substrates [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Concentration Risk, Percentage |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
67.00%
|
|
|
|
|
|
| Raw Materials [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| Concentration Risk, Percentage |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
33.00%
|
|
|
|
|
|
|
|