Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2020
Mar. 30, 2021
Jun. 30, 2020
Dec. 31, 2019
Registrant Name Mentor Capital, Inc.      
Registrant CIK 0001599117      
Fiscal Year End --12-31      
Document Type 10-K      
Document Period End Date Dec. 31, 2020      
Entity File Number 000-55323      
Entity Incorporation, State or Country Code DE      
Entity Tax Identification Number 77-0395098      
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      
Entity Address, Address Description Address of principal executive offices      
Phone Fax Number Description Registrant’s telephone number, including area code      
City Area Code 760      
Local Phone Number 788-4700      
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      
Entity Ex Transition Period false      
Entity Shell Company false      
Entity Public Float     $ 1,899,590  
Entity Common Stock, Shares Outstanding   22,850,947    
Preferred Stock, Shares Outstanding 11 [1] 11   11
Amendment Flag false      
Document Fiscal Year Focus 2020      
Document Fiscal Period Focus FY      
Document Annual Report true      
Document Transition Report false      
[1] * Par value is less than $0.01