XML 10 R1.htm IDEA: XBRL DOCUMENT v3.20.2
Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2020
Nov. 09, 2020
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Entity Registrant Name TENGASCO INC  
Entity Central Index Key 0001001614  
Entity File Number 1-15555  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 87-0267438  
Entity Address, Address Line One 8000 E. Maplewood Ave  
Entity Address, Address Line Two Suite 130  
Entity Address, City or Town Greenwood Village  
Entity Address, State or Province CO  
Entity Address, Postal Zip Code 80111  
City Area Code 720  
Local Phone Number 420-4460  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Current Fiscal Year End Date --12-31  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Trading Symbol tgc  
Title of 12(b) Security Common Stock  
Security Exchange Name NYSE  
Entity Common Stock, Shares Outstanding   10,684,417