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ORGANIZATION AND NATURE OF BUSINESS (Details)	12 Months Ended
	Dec. 31, 2018
Furniture and Fixtures [Member]
Estimated Useful Life	40 years
Vehicles [Member] | Minimum [Member]
Estimated Useful Life	6 years
Vehicles [Member] | Maximum [Member]
Estimated Useful Life	20 years
Machinery [Member]
Estimated Useful Life	20 years
Furniture, fixtures and equipment [Member] | Minimum [Member]
Estimated Useful Life	5 years
Furniture, fixtures and equipment [Member] | Maximum [Member]
Estimated Useful Life	10 years
Computers and software [Member] | Minimum [Member]
Estimated Useful Life	3 years
Computers and software [Member] | Maximum [Member]
Estimated Useful Life	5 years

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=COSM_LeaseholdImprovementsAndTechnicalWorksMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=COSM_MachineryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: