Represents the length of harness racing track used by the related party of the entity.

No definition available.

Name:	dvd_LengthOfHarnessRacingTrackUsedByRelatedParty
Namespace Prefix:	dvd_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the length of the motorsports superspeedway racing track.

+ References

No definition available.

+ Details

Name:	dvd_LengthOfMotorsportsSuperspeedwayRacingTrack
Namespace Prefix:	dvd_
Data Type:	num:lengthItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of annual motorsports weekends for which use of indoor grandstands is allowed by the related party.

+ References

No definition available.

+ Details

Name:	dvd_NumberOfAnnualMotorsportsWeekendsForWhichUseOfIndoorGrandstandsAllowedByRelatedParty
Namespace Prefix:	dvd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the period, before and after the period of exclusive use of harness track, for which the related party has set up and tear down rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	dvd_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of voting power of the entity held by the related party of the entity.

+ References

No definition available.

+ Details

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Namespace Prefix:	dvd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the percentage of voting power of another related party held by the related party.

+ References

No definition available.

+ Details

Name:	dvd_RelatedPartyTransactionMinimumPercentageOfVotingPowerHeldByRelatedPartyInOtherRelatedParty
Namespace Prefix:	dvd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of payable due to an entity that is affiliated with the reporting entity by means of direct or indirect ownership. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(12)(b)(3))
-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a)(5))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Related Parties
-URI http://asc.fasb.org/extlink&oid=16382449

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07.1(c))
-URI http://asc.fasb.org/extlink&oid=6488393&loc=d3e606610-122999

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=dvd_DoverDownsGamingAndEntertainmentIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_BoardOfDirectorsChairmanMember
Namespace Prefix:
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Related Party Transactions (Details)	3 Months Ended		6 Months Ended
Related Party Transactions (Details)	Jun. 30, 2017 USD ($) item	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) item mi	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Related Party Transactions
Length of motorsports superspeedway of entity (in miles) \| mi			1
Dover Downs Gaming and Entertainment Inc
Related Party Transactions
Costs for administrative and operating services, including leased space allocated by related party	$ 516,000	$ 520,000	$ 969,000	$ 995,000
Administrative and operating service costs allocated to related party	109,000	28,000	140,000	111,000
Payable to Dover Downs Gaming & Entertainment, Inc.	$ 33,000		$ 33,000		$ 7,000
Length of harness racing track used (in miles) \| mi			0.625
Period, before and after the period of exclusive use of harness track, for which related party has set up and tear down rights ( in weeks)			14 days
Number of annual motorsports weekends for which use of indoor grandstands is allowed by related party \| item	2		2
Dover Downs Gaming and Entertainment Inc \| Dover Facility
Related Party Transactions
Costs for administrative and operating services, including leased space allocated by related party	$ 460,000	426,000	$ 460,000	426,000
Administrative and operating service costs allocated to related party	$ 107,000	$ 91,000	$ 107,000	$ 91,000
Board of Directors Chairman
Related Party Transactions
Minimum percentage of voting power controlled by related party	50.00%		50.00%
Minimum percentage of voting power of Gaming controlled by other related party	50.00%		50.00%