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Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment, Net | Note 8 - Property, Plant and Equipment, Net
|  | December 31 |
|  | 2020 |  |  | 2021 |
|  | US$ thousands |
Machinery and equipment |  |  | 15,494 |  |  |  | 17,305 |
Office furniture and equipment |  |  | 991 |  |  |  | 1,129 |
Leasehold improvements |  |  | 2,884 |  |  |  | 3,406 |
Property, plant and equipment |  |  | 19,369 |  |  |  | 21,840 |
Accumulated depreciation |  |  | (15,259 | ) |  |  | (17,264 | )
Property, Plant and equipment, net |  |  | 4,110 |  |  |  | 4,576 |
Depreciation expense for the years ended December 31, 2019, 2020 and 2021 were US$ 1,731 thousand, US$ 2,000 thousand and US$ 2,009 thousand, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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