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Note 17 - Commitments and Contingencies (Details Textual)	Oct. 23, 2025	Oct. 14, 2025	Oct. 07, 2025	Aug. 29, 2025
Derivative Lawsuits Filed in US District Court for District of Oregon [Member]
Loss Contingency, New Claims Filed, Number				1
Derivative Lawsuits Filed in US District Court for District of Oregon [Member] | Subsequent Event [Member]
Loss Contingency, New Claims Filed, Number		1	1
Derivative Lawsuits Filed in Circuit Court of State of Oregon [Member] | Subsequent Event [Member]
Loss Contingency, New Claims Filed, Number	1

X

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-4

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-9

+ Details

Name:	us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_LitigationCaseAxis=dmrc_DerivativeLawsuitsFiledInUsDistrictCourtForDistrictOfOregonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_LitigationCaseAxis=dmrc_DerivativeLawsuitsFiledInCircuitCourtOfStateOfOregonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: