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Note 2 - Fair Value of Financial Instruments - Summary of Fair Value Maturities for Financial Asset (Details) $ in Thousands	Jun. 30, 2025 USD ($)
Assets, fair value	$ 14,367
Cash equivalents and marketable securities, less than 1 year	14,367
Cash equivalents and marketable securities, 1-5 years	0
Cash equivalents and marketable securities, 5-10 years	0
Cash equivalents and marketable securities, more than 10 years	$ 0

X

- Definition

Cash equivalents and marketable securities maturity less than one year, fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	dmrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cash equivalents and marketable securities maturity more than ten year, fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	dmrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cash equivalents and marketable securities maturity year five through ten year, fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	dmrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Cash equivalents and marketable securities maturity year one through five year, fair value.

+ References

No definition available.

+ Details

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Namespace Prefix:	dmrc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Fair value portion of asset recognized for present right to economic benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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Period Type:	instant