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Summary of Significant Accounting Policies - Schedule of Estimated Useful Life of Property and Equipment (Details) (Southwestern Montana Financial Center, Inc.) - Southwestern Montana Financial Center, Inc. [Member]	12 Months Ended
	Dec. 31, 2018
Office Equipment [Member]
Estimated useful life	5 years
Vehicles [Member]
Estimated useful life	5 years
Furniture and Fixtures [Member]
Estimated useful life	7 years
Leasehold Improvements [Member]
Estimated useful life	15 years

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- 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:	dei_LegalEntityAxis=RELI_SouthwesternMontanaFinancialCenterIncMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OfficeEquipmentMember
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Balance Type:
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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix:
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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
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X

- Details

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