Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2017
Mar. 15, 2018
Jun. 30, 2017
Registrant Name Mentor Capital, Inc.    
Registrant CIK 0001599117    
SEC Form 10-K    
Period End date Dec. 31, 2017    
Fiscal Year End --12-31    
Trading Symbol mntr    
Tax Identification Number (TIN) 770395098    
Number of common stock shares outstanding   23,076,676  
Public Float     $ 19,078,307
Filer Category Smaller Reporting Company    
Current with reporting Yes    
Voluntary filer No    
Well-known Seasoned Issuer No    
Amendment Flag false    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Entity Incorporation, State Country Name Delaware    
Entity Address, Address Line One 511 Fourteenth Street, Suite A-2, A-4, A-6    
Entity Address, City or Town Ramona    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 92065    
City Area Code 760    
Local Phone Number 788-4700