Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 22, 2021	Jun. 30, 2020
Entity Registrant Name	DOVER MOTORSPORTS INC
Entity Central Index Key	0001017673
Document Type	10-K
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 23,263,564
Transition Report	false
Common Stock [Member] | Common Stock
Entity Common Stock, Shares Outstanding		17,951,616
Common Stock [Member] | Common Class A [Member]
Entity Common Stock, Shares Outstanding		18,509,975