Document And Entity Information - USD ($) |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Mar. 31, 2026 |
Jun. 28, 2024 |
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| Cover [Abstract] | ||||
| Entity Central Index Key | 0000882361 | |||
| Entity Registrant Name | Aptose Biosciences Inc. | |||
| Amendment Flag | false | |||
| Current Fiscal Year End Date | --12-31 | |||
| Document Fiscal Period Focus | FY | |||
| Document Fiscal Year Focus | 2025 | |||
| Document Type | 10-K | |||
| Document Annual Report | true | |||
| Document Period End Date | Dec. 31, 2025 | |||
| Document Transition Report | false | |||
| Securities Act File Number | 001-32001 | |||
| Entity Incorporation, State or Country Code | Z4 | |||
| Entity Tax Identification Number | 98-1136802 | |||
| Entity Address, Address Line One | 66 Wellington Street WestSuite 5300 | |||
| Entity Address, Address Line Two | TD Bank Tower Box 48 | |||
| Entity Address, City or Town | Toronto | |||
| Entity Address, State or Province | ON | |||
| Entity Address, Postal Zip Code | M5K 1E6 | |||
| City Area Code | 647 | |||
| Local Phone Number | 479-9828 | |||
| 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 Small Business | true | |||
| Entity Emerging Growth Company | false | |||
| ICFR Auditor Attestation Flag | false | |||
| Document Financial Statement Error Correction [Flag] | false | |||
| Entity Shell Company | false | |||
| Entity Public Float | $ 22,075,799 | |||
| Entity Common Stock, Shares Outstanding | 2,552,429 | |||
| Documents Incorporated by Reference [Text Block] |
DOCUMENTS INCORPORATED BY REFERENCE |
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| Auditor Opinion [Text Block] |
Opinion on the Financial Statements We have audited the accompanying consolidated statement of financial position of Aptose Biosciences Inc. (the Company) as of December 31, 2025, and the related consolidated statements of loss and comprehensive loss, changes in shareholders’ deficit and cash flows for the year ended December 31, 2025, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2025, and the results of its operations and its cash flows for the year ended December 31, 2025, in conformity with U.S. generally accepted accounting principles. |
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| Auditor Name | Ernst & Young LLP | KPMG LLP | ||
| Auditor Location | Toronto, Canada | Vaughan, Canada | ||
| Auditor Firm ID | 1263 | 85 | ||
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