Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Mar. 25, 2020
Jun. 30, 2019
Cover [Abstract]      
Entity Registrant Name Black Ridge Oil & Gas, Inc.    
Entity Central Index Key 0001490161    
Document Type 10-K/A    
Document Period End Date Dec. 31, 2019    
Amendment Flag true    
Current Fiscal Year End Date --12-31    
Entity a Well-known Seasoned Issuer No    
Entity a Voluntary Filer No    
Entity's Reporting Status Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Emerging Growth Company false    
Entity Small Business true    
Entity Shell Company false    
Entity File Number 000-53952    
Entity Interactive Data Current Yes    
Entity Incorporation, State or Country Code NV    
Entity Public Float     $ 10,694,484
Entity Common Stock, Shares Outstanding   1,600,484  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Amendment description To correct the presentation of unrealized losses