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Note 17 - Commitments and Contingencies (Details Textual) | Oct. 23, 2025 | Oct. 14, 2025 | Oct. 07, 2025 | Aug. 29, 2025
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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

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

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

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