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Government Funding (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 11, 2020
Government Funding [Abstract]
Amount awarded		$ 5.5
Amount invoiced	$ 2.4

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- Definition

Government Funding [Abstract]

+ References

No definition available.

+ Details

Name:	eman_GovernmentFundingAbstract
Namespace Prefix:	eman_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Government Funding, Amount Awarded

+ References

No definition available.

+ Details

Name:	eman_GovernmentFundingAmountAwarded
Namespace Prefix:	eman_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Government Funding, Amount Receivables

+ References

No definition available.

+ Details

Name:	eman_GovernmentFundingAmountReceivables
Namespace Prefix:	eman_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant