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INVESTMENT IN SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2023
Marketable Securities [Abstract] |
Summary of Investment in Securities Current and Noncurrent | Investment in securities – current and noncurrent consist of the following:
|  | December 31 |
(in US$ thousands) |  | 2023 |  |  | 2022 |
Debt securities, classified as available-for-sale |  | $ | 5,548 |  |  | $ | 7,950 |
Equity securities |  |  | 229 |  |  |  | 2,371 |
|  | $ | 5,777 |  |  | $ | 10,321 |

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