| Cover | 12 Months Ended |
| Dec. 31, 2022 shares | |
| Document Information [Line Items] | |
| Document Type | 20-F/A |
| Amendment Flag | true |
| Amendment Description | This Amendment No. 1 to Form 20-F (the "Form 20-F/A") amends our annual report on Form 20-F for the year ended December 31, 2022 (the "Annual Report"), which was originally filed with the U.S. Securities and Exchange Commission on May 30, 2023. The purpose of this Form 20-F/A is (i) to amend Item 16I of the Annual Report to provide the disclosures required under Item 16I(b) of Form 20-F and (ii) to provide the documentation required by Item 16I(a) of Form 20-F in the form of an exhibit to this Form 20-F/A. This Form 20-F/A does not reflect events occurring after the filing of the Annual Report and does not modify or update the disclosure therein in any way except as described above. No other changes have been made to the Annual Report. The filing of this Form 20-F/A should not be understood to mean that any statements contained in the Annual Report, as amended by this Form 20-F/A, are true or complete as of any date subsequent to the original filing date of the Annual Report. Accordingly, this Form 20-F/A should be read in conjunction with the Annual Report. |
| Document Registration Statement | false |
| Document Annual Report | true |
| Document Transition Report | false |
| Document Shell Company Report | false |
| Document Period End Date | Dec. 31, 2022 |
| Document Fiscal Period Focus | FY |
| Document Fiscal Year Focus | 2022 |
| Current Fiscal Year End Date | --12-31 |
| Entity File Number | 000-53826 |
| Entity Registrant Name | PLASTEC TECHNOLOGIES, LTD. |
| Entity Central Index Key | 0001433309 |
| Entity Incorporation, State or Country Code | E9 |
| Entity Address, Address Line One | c/o Unit 01, 21/F, Aitken Vanson Centre |
| Entity Address, Address Line Two | 61 Hoi Yuen Road, Kwun Tong |
| Entity Address, City or Town | Kowloon |
| Entity Address, Country | HK |
| Title of 12(g) Security | Ordinary Share, par value U.S.$0.001 per share |
| Entity Well-known Seasoned Issuer | No |
| Entity Voluntary Filers | No |
| Entity Current Reporting Status | Yes |
| Entity Interactive Data Current | Yes |
| Entity Filer Category | Non-accelerated Filer |
| Entity Emerging Growth Company | false |
| Document Accounting Standard | U.S. GAAP |
| Entity Shell Company | true |
| Entity Common Stock, Shares Outstanding | 12,938,128 |
| ICFR Auditor Attestation Flag | false |
| Auditor Name | Centurion ZD CPA & Co. |
| Auditor Firm ID | 2769 |
| Auditor Location | Hong Kong, China |
| Business Contact [Member] | |
| Document Information [Line Items] | |
| Entity Address, Address Line One | c/o Unit 01, 21/F, Aitken Vanson Centre |
| Entity Address, Address Line Two | 61 Hoi Yuen Road, Kwun Tong |
| Entity Address, City or Town | Kowloon |
| Entity Address, Country | HK |
| City Area Code | 852 |
| Local Phone Number | 21917155 |
| Contact Personnel Name | Kin Sun Sze-To |
| Contact Personnel Fax Number | 852-27796001 |
