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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 12, 2026
Jun. 30, 2025
Cover [Abstract]      
Entity Central Index Key 0000728387    
Entity Registrant Name Perspective Therapeutics, 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    
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    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol CATX    
Security Exchange Name NYSEAMER    
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     $ 212,873,547
Entity Common Stock, Shares Outstanding   113,933,436  
Auditor Firm ID 100    
Auditor Name WithumSmith+Brown, PC    
Auditor Location San Francisco, CA, USA    
Documents Incorporated by Reference [Text Block]

Part III of this Annual Report on Form 10-K incorporates certain information by reference from the registrant's proxy statement for the 2026 annual meeting of stockholders to be filed no later than 120 days after the end of the registrant's fiscal year ended December 31, 2025.