Annual report [Section 13 and 15(d), not S-K Item 405]

Cover

v3.26.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Mar. 31, 2026
Jun. 30, 2025
Cover [Abstract]        
Document Type 10-K      
Amendment Flag false      
Document Annual Report true      
Document Transition Report false      
Document Period End Date Dec. 31, 2025      
Document Fiscal Period Focus FY      
Document Fiscal Year Focus 2025      
Current Fiscal Year End Date --12-31      
Entity File Number 000-55323      
Entity Registrant Name Mentor Capital, Inc.      
Entity Central Index Key 0001599117      
Entity Tax Identification Number 77-0395098      
Entity Incorporation, State or Country Code DE      
Entity Address, Address Line One 5964 Campus Court      
Entity Address, City or Town Plano      
Entity Address, State or Province TX      
Entity Address, Postal Zip Code 75093      
City Area Code 760      
Local Phone Number 788-4700      
Title of 12(g) Security Common Stock      
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 true      
Elected Not To Use the Extended Transition Period false      
Entity Shell Company false      
Entity Public Float       $ 997,561
Entity Common Stock, Shares Outstanding     21,683,189  
ICFR Auditor Attestation Flag false      
Document Financial Statement Error Correction [Flag] false      
Auditor Firm ID 677 349    
Auditor Name Cherry Bekaert LLP Spicer Jeffries LLP    
Auditor Location Denver, Colorado Denver, Colorado    
Auditor Opinion [Text Block] We have audited the accompanying consolidated balance sheet of Mentor Capital, Inc. (the “Company”) as of December 31, 2025, and the related consolidated statement of income, changes in shareholders’ equity (deficit) and cash flows for the year then ended, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025, and the results of its consolidated operations and its consolidated cash flows for the year then ended, in conformity with accounting principles generally accepted in the United States of America.