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Note 17 - Geographic Information (Tables) | 3 Months Ended
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Mar. 31, 2023
Notes Tables |
Revenue from External Customers by Geographic Areas [Table Text Block] |
|  | Three months ended March 31, |
​ |  | 2023 |  |  | 2022 |
Revenues: |  | ​ |  |  | ​ |
United States |  | $ | 6,439 |  |  | $ | 2,559 |
Taiwan |  |  | 42,386 |  |  |  | 27,779 |
China |  |  | 4,205 |  |  |  | 21,904 |
​ |  | $ | 53,030 |  |  | $ | 52,242 |
Long-Lived Assets by Geographic Areas [Table Text Block] |
|  | As of the period ended |
​ |  | March 31, |  |  | December 31, |
​ |  | 2023 |  |  | 2022 |
Long-lived assets: |  | ​ |  |  | ​ |
United States |  | $ | 78,048 |  |  | $ | 80,048 |
Taiwan |  |  | 49,628 |  |  |  | 50,777 |
China |  |  | 93,828 |  |  |  | 93,888 |
​ |  | $ | 221,504 |  |  | $ | 224,713 |

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