Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Aug. 10, 2020
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
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 Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		10,680,050
Title of 12(b) Security	Common Stock
Trading Symbol	tgc
Security Exchange Name	NYSE
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false