| Document And Entity Information | Aug. 12, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Document Period End Date | Aug. 12, 2024 |
| Entity Registrant Name | Perspective Therapeutics, Inc. |
| Entity Central Index Key | 0000728387 |
| Entity Emerging Growth Company | false |
| Entity File Number | 001-33407 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 41-1458152 |
| Entity Address, Address Line One | 2401 Elliott Avenue, Suite 320 |
| Entity Address, City or Town | Seattle |
| Entity Address, State or Province | WA |
| Entity Address, Postal Zip Code | 98121 |
| City Area Code | (206) |
| Local Phone Number | 676-0900 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.001 par value |
| Trading Symbol | CATX |
| Security Exchange Name | NYSEAMER |
| Amendment Description | This Current Report on Form 8-K/A (this Amendment) is being filed solely to replace the version of Exhibit 99.1 (the Initial Exhibit) attached to the Company's Current Report on Form 8-K filed with the Securities and Exchange Commission on August 12, 2024 (the Initial 8-K) and amends and restates the Initial 8-K in its entirety. Due to a clerical error, an incorrect version of the Initial Exhibit was attached as an exhibit to the Initial 8-K. |
