Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Mar. 23, 2020	Jun. 28, 2019
Document And Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Fiscal Year Focus	2019
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	1-15555
Entity Registrant Name	TENGASCO INC
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 Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Fiscal Period Focus	FY
Entity Central Index Key	0001001614
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
Title of 12(b) Security	Common Stock
Trading Symbol	tgc
Security Exchange Name	NYSE
Entity Public Float			$ 4.4
Entity Common Stock, Shares Outstanding		10,666,211