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Note 11 - Segment Information and Foreign Operations (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Revenue from External Customers by Products and Services [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Product Type: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Substrates |  | $ | 21,259 |  |  | $ | 15,007 |  |  | $ | 43,633 |  |  | $ | 51,655 |
Raw Materials and Other |  |  | 6,696 |  |  |  | 8,638 |  |  |  | 21,652 |  |  |  | 22,601 |
Total |  | $ | 27,955 |  |  | $ | 23,645 |  |  | $ | 65,285 |  |  | $ | 74,256 |
Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Geographical region: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
China |  | $ | 13,145 |  |  | $ | 13,807 |  |  | $ | 41,063 |  |  | $ | 42,271 |
Taiwan |  |  | 9,045 |  |  |  | 2,140 |  |  |  | 10,796 |  |  |  | 10,142 |
Japan |  |  | 1,854 |  |  |  | 1,623 |  |  |  | 3,276 |  |  |  | 3,409 |
Asia Pacific (excluding China, Taiwan and Japan) |  |  | 347 |  |  |  | 797 |  |  |  | 1,555 |  |  |  | 2,307 |
Europe (primarily Germany) |  |  | 3,424 |  |  |  | 2,720 |  |  |  | 7,122 |  |  |  | 11,134 |
North America (primarily the United States) |  |  | 140 |  |  |  | 2,558 |  |  |  | 1,473 |  |  |  | 4,993 |
Total |  | $ | 27,955 |  |  | $ | 23,645 |  |  | $ | 65,285 |  |  | $ | 74,256 |
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] |
|  | As of |
|  | September 30, |  |  | December 31, |
|  | 2025 |  |  | 2024 |
Long-lived assets by geographic region, net of depreciation: |  |  |  |  |  |  |  |
North America |  | $ | 1,115 |  |  | $ | 1,353 |
China |  |  | 160,271 |  |  |  | 160,847 |
|  | $ | 161,386 |  |  | $ | 162,200 |

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- Definition Tabular disclosure of the names of foreign countries in which material long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets are located, and amount of such long-lived assets located in that country or foreign geographic area. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 41 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + Details
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- Definition Tabular disclosure of entity-wide revenues from external customers for each product or service or each group of similar products or services if the information is not provided as part of the reportable operating segment information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-40 + Details
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