XML 20 R1.htm IDEA: XBRL DOCUMENT v3.20.4
Cover - USD ($)
 12 Months Ended
Jan. 03, 2021
Mar. 11, 2021
Jun. 28, 2020
Cover [Abstract]      
Entity Registrant Name BT BRANDS, INC.    
Entity Central Index Key 0001718224    
Document Type 10-K    
Amendment Flag false    
Entity Voluntary Filers No    
Current Fiscal Year End Date --01-03    
Entity Well Known Seasoned Issuer No    
Entity Small Business true    
Entity Shell Company false    
Entity Emerging Growth Company true    
Entity Current Reporting Status Yes    
Document Period End Date Jan. 03, 2021    
Entity Filer Category Non-accelerated Filer    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Entity Ex Transition Period false    
Entity Common Stock Shares Outstanding   4,047,502  
Entity Public Float     $ 8,056,260
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes