XML 54 R43.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Summary of Significant Accounting Policies - Summary of Property and Equipment (Details) | 3 Months Ended
--- | ---
Mar. 31, 2017
Leasehold Land And Buildings [Member] | Investment Property [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life | 50 years
Residual Value |
Leasehold Land And Buildings [Member] | Plant And Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Residual Value |
Furniture and Fixtures [Member] | Investment Property [Member] |
Property, Plant and Equipment [Line Items] |
Residual Value | 5.00%
Furniture and Fixtures [Member] | Investment Property [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life | 3 years
Furniture and Fixtures [Member] | Investment Property [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life | 10 years
Furniture and Fixtures [Member] | Plant And Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Residual Value | 5.00%
Furniture and Fixtures [Member] | Plant And Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life | 3 years
Furniture and Fixtures [Member] | Plant And Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life | 10 years
Office Equipment [Member] | Investment Property [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life | 3 years
Residual Value | 5.00%
Office Equipment [Member] | Investment Property [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life | 10 years
Residual Value | 10.00%
Office Equipment [Member] | Plant And Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life | 3 years
Residual Value | 5.00%
Office Equipment [Member] | Plant And Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life | 10 years
Residual Value | 10.00%
Leasehold Improvements [Member] | Investment Property [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life, description | Over the shorter of estimated useful life or term of lease
Residual Value |
Leasehold Improvements [Member] | Plant And Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Expected useful life, description | Over the shorter of estimated useful life or term of lease
Residual Value |

X
- Definition Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68071081&loc=d3e1205-110223 + Details
Name: | us-gaap_PropertyPlantAndEquipmentEstimatedUsefulLives
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandBuildingsAndImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=GRNQ_InvestmentPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=GRNQ_PlantAndEquipmentMember
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_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |